A really good idea to get to the next level is to buy big players at the end of the season. Super common because it worked, hence why they changed the gameshape rules. Checking around leagues/forums in these playoffs will give a good idea of how teams will suffer and to what extent.
This really bleeds down into many other things, including complete season management. I know I have had a couple of seasons where I figured to be competitive and would save money all season specifically to buy a big or two for the playoffs. If this won't be the case anymore:
1. Have to plan earlier. Bankroll may have to be higher in beginning/middle?
2. Transfer list will be heavier with heaveir prices more towards middle of season.
3. If you are training that season, you will miss out on weeks due to having to train gameshape for the playoffs.
a. more money because you would drop your trainer to train GS
b. team is less trained
4. Teams with more cash have to think earlier going forward and can't throw money at things right before playoffs.
I don't know...I am sure we could list dozens of things ...but it all should be interesting and could tweak the game in a bigger way than just thinking about the individual players being purchased.