I won't need this but is Forum provision likely to be made for those who are still forced to use it? They will need some outlet, say, for finding usable lots and CAS and downloading from links until they can upgrade. Some with 64 bit but without video cards can also get problems with Sims 4 and play 32 bit.
The Gallery, game banners, and social integrations will be disabled. The Sims 4: Legacy Edition will not display or allow any purchases of content released after February 2019.