Multiple vs one schema in a Forms context

Hello,
I was asked a question relating to a Forms application architected as follows:
The main application is comprised of 10 sub-systems. Each system is related to a schema with a given owner. However, there are a number of grants that are required since systems within the application are inter-related. This is normal behavior for an ERP.
Everything has been working fine until now but the DBA raised a point of view which is the following: Why not regroup all of the object in the different containers and have a single container for all of the application ?
The main argument is that there is going to be a performance boost for our Forms application. Most likely, this is not a performance as far as access is concerned since access can be improved by tuning the app server. I see it as improvement from the DB side.
From your own experience, is it better to maintain the current approach with several containers or make the jump and have one single container for our Forms app.
I understand this might be seen as a database question but I am more interested with those that have the same experience in a Forms environment.
Thanks.

Hello all,
First of all, thanks for the excellent comments.
All the schemas are on the same server. There are no personal accounts used for the application. Only the applications accounts (10) are used within the system.
The existing structure as I see it is very easy for the developers as far as maintenance is concerned because whenever they have to work on FMBs, they just check the subsystem (DB side) they are working on.
Downside as mentionned is the DBA tasks and mostly the grants that are needed since the app accounts are required to have some grants because of all the interconnection within the subsystems (for example form A in one subsystems has a block based on 2 tables from two different schemas).
I am more inclined to believe that the current system, as it is structured now, is fine but we might need to work on the security aspect. Currently, users are granted privileges thru BD roles and this is quite cumbersome to manage. An easier approach would be to create a finite number of logon profiles in our Form app and that will be used for our users whenever they log on to the system.
This will probably solve the grants problem I mentionned in the beginning.

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