I hate to sound this way, but that sounds like a total crock. We had a number of critical problems in our production environment following the 8.9 upgrade and consultants were sent onsite after multiple calls to you know who. They pointed at a lot of things that had absolutely no bearing to the issue, wasted a lot of our time, and ultimately served no purpose other than to be a conduit to internal JDE developers who were able to generate an engineering fix for specific system libraries on the HP UNIX server. We could have done that ourselves if we had that type of access. It is much better now, I must say. They should be commended for their improved customer service at least as far as it goes with my company.
You should be able to function properly with the standard environments. Although I've heard the J environments offered as a replacement for the old W environments, remember that the code was written on Windows clients and should certainly run best there! The few times you might run into problems are when you map specific business functions to a server and do not include their associated class partners. We have only a bare minimum of functions mapped to the Enterprise server and those are only there to allow Vertex connections among other things.
You may have already stated this in one of your previous posts, so pardon me if I'm repeating something, but one thing you should check is that the *PUBLIC DEFAULT BSFN mapping is LOCAL in the SYSTEM - 810 datasource and that you have turned off the 400 or so BSFN objects which *may* have received a server mapping by virtue of the planner configuration. This could have been fixed by the time you upgraded, however. We upgraded our development environments from Xe to 8.9 in September 2003 and had hordes of problems due to Business Function mappings. Some business functions actually would not function at all on a UNIX enterprise server without applying ESU's or paper fixes. The disclaimer to my statement is that we aren't running 8.10, but I would have to say that 8.9 is close in many ways.
