APEX vs OAFramework or JSP

Hello Folks,
I have been evangelizing APEX at Dell and amazed with the reduction in time/effort required to create scalable applications.
Now a lot of our extensions/custom development is done using OAFRamework, which is time consuming and the skills of our dev team are sometimes lacking.
My question is, what would be the reasons to choose OAFramework/J2EE instead of APEX knowing that our development environment is Ebusiness suite and all the applications are basically running on E-Biz data model and API ?
Most of our applications are internal applications ( Work within the firewalls) and the business processes are very dynamic.
OA FRamework is simply very complex and we are facing scaling/performance issues with that and surprisingly not with APEX. Probably because OAFramework involves lot of custom code written by our developers vs APEX which is more like managed code.
So to summarize my query.
1. Where to use APEX ( Limitations)
2. Where to use OAFramework
3. Performance/scaling/security etc concerns for APEX
4. Why doesn't Oracle use APEX for its e-biz suite, instead of using OA Framework or jtt framework.
Rgds,
Venkatesh

Venkatesh,
Just happened to see this thread and thought that I will share my view too. Actually because you are from Apex background, you should had posted this issue in OAF forum to get more of the OAF view and then compare with yours.
APEX is good and fast but doesn't have direct integration features with EBiz. It also doesn't support many of the advanced features of Apps. So when it comes to simple applications, APEX is fine, but when a full fledge application with complex UI is required, you need a framework and not just a tool.
Also can you confirm whether you are using OAF for extension of Apps or for creating custom applications?
You were talking about performance issue. Can you confirm it was the OA code and not the underlying pl/sql code? Most of the ebiz is running on OAF and there are no inherent performance issues with it. When you say your code is giving performance issue, there might be many reasons and most of them should have a solution with either code or design.
--Shiv                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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  • URGENT: Oracle EBS 12.1.3 to Apex 4.1.1

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    I performed steps as given by Oracle White paper on Integrating Oracle EBS to APEX
    http://www.oracle.com/technetwork/developer-tools/apex/learnmore/apex-ebs-extension-white-paper-345780.pdf
    1. Create Application in Oracle Apex.
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    4. Create Menu of ( Type as HOME page) and attach in resp.
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    Please help on it.
    Edited by: user11672064 on Nov 30, 2012 6:38 AM

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