Re: PS5 & PC
@SgtSlaughtah I don't use Steam so perhaps someone who does will see this thread and give a definite answer.
In general, you should not have a problem playing different games on different machines regardless of what app you launch from.
However, if you want to play the same game, like The Sims 4, then you would likely only be able to do that between a PC and a console like PS5, since the games are not cross-platform compatible. I highly doubt that you'd be able to play TS4 on one PC using the EA app and play a Steam version of TS4 on another PC if your EA account is linked.