ABAP or BI for a report?

Dear All,
I've compiled a list below of what to look for when a consultant needs to decide whether to have a report created in SAP BI (as opposed to ABAP/Report Painter in R3).
The list also includes points that can motivate a company to purchase a BI system/any data warehouse.
I would really be grateful if anyone out there can add to this (or correct it if I've been mistaken).
Also it would be very useful to know what kind of reports one should not do in BI - any learnings from project experiences are welcome!
LIST:
A company can consider buying a data warehousing solution based on:
1. Size of the company - Do they really need a data warehouse; consider R.O.I.
2. No. of Power Users - Are there enough that will make use of analytical reports?
3. Are they concerned about the strain on R3 that source system reporting will cause?
4. Do they need to analyse historical data? / Data Mining
A report is best done in BI if:
1. It is an analytical report that uses OLAP operations (e.g. drill down, slice and dice etc.) so ABAP or Report Painter will not do.
2. The report involves What-If Analysis
3. Graphs, Charts are very useful to the report-user
4. Historical data or trend analysis is expected / Data Mining
5. The report does not carry textual information (e.g. not master data texts but textual data beyond this)
6. If the report needs data brought in from multiple Source Systems (SAP, non-SAP)
7. The report is not frequently changed

Hello,
Many points you have already covered, but to explain few of them.
6. If the report needs data brought in from multiple Source Systems (SAP, non-SAP)
    Here you can get actual data from ECC system and update you budget or targets from flat file. That will provide good analysis of actual Vs targets. this may not be very simple in ECC reporting.
    Multiple source system like ECC, Flat File, Oracle, SRM, CRM. When business is using all these system, only way to get reporting is from BI without troubling other system servers.
3. Graphs, Charts are very useful to the report-user
    While reporting actual vs targets, graph and charts provides very presentable reports. Not possible in ECC.
You can create Dashboards in BI where you can have charts and data together and options of publishing such dashboards directly to Emails of specific users. No need to even execute reports, they will have reports/dashboard in their mail box everyday/weekly..

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