Starting a save pre winter update

Obviously the official winter update is arriving soon.

If I would download any extensive transfer update there is no real reason to wait, is there? Since most bugs/gameplay fixes are save compatible.
Or am I mistaken?

It depends on what league you play in and how realistic you want the game to be. Our data update adds changes to almost 27,000 people and should include most transfers in the relevant leagues, but there will still be a lot of things that are missing. Plus the winter update also adds players/staff to the database that were missing in the base game.

Another big thing about the winter update is that it updates attributes and CA/PA for a lot of players based on their performance so far this season. For some players this will make a huge difference in how their career develops.

Also bug fixes to things like scouting etc. are not compatible with an existing save. So if you're planning to start a long-term career, I would just wait a few more days.