I'm good friends with WTF, so I will check with him to see if that is confirmed.

I know EA has confidence and likes their roster update system, but - in addition to the reasons you gave - it would be nice for editing just so people can be creative in making 'dream' rosters, playing out trade scenarios, etc. It seems that EA & the GC Program (especially Live this year) has shifted heavily (exclusively?) to prominent YouTube creators, so not having roster editing leaves out a significant tool/option they could be using in making content related to the title. It ends up being a bit inconsistent in their development approach.

This is the first year since Live returned with 14 that they will have had the same person in charge of rosters for consecutive versions of the title, so maybe that will help improve the quality of them. Though, she will soon be gone for a while on maternity leave and I do not know if she will be contributing/working from home and/or will hop back in once leave is over.