I don't know if the same restrictions regarding the number of careers are in place on a PC, it might be platform specific.
But even if, yes on a PC you can move the saves at will.
Xbox series x
I was planning on getting the game on pc and ps5 later
There are almost always some limit on save data for a game, I don't know if Bioware will extend this, but I doubt it.
What you can do is saving some of your careers to an external hard drive and delete them on the main drive.
I might have spoken to soon, looks like MS scraped that option because of save file hacking. Sony did the same with the PS5.
You might be able to work around that with the cloud saves like described in the last post here, but I have no way of testing it nor can I say if there is a risk on loosing the cloud saves.
so sounds like I cannot play the game anymore then guess I will go back to the old versions at least they did not limit you
