MMOEXP: It is certainly not a replacement for FC 25
Seasons is a staple game mode that allows players to play against each other with any official team. There are 10 Divisions, with players starting off in the bottom (10) division and fighting to get to Division 1. Players can choose teams with FC 25 Coins the highest rated forwards or highest rated goalkeepers, or choose lesser-known teams in the 3 or 4-star region.
With any official team available for selection, and a simpler ranking system that players can get their time to get to the top of; Online Seasons is better for the everyday gamer because of its simplicity. It's a little predictable that players always pick the best teams such as PSG, and there's still a bit of meta reliance from players just like in the Ultimate Team.
Career Mode is one of the longest-lasting modes available on FIFA, having entered the series in FIFA 04. Players can choose a team from any league across any part of the world, and create their own world. Fostering new players through the Youth Academy, balancing Board Expectations and Team Morale with multiple competitions throughout the year. Building a team that gets to the Champions League within 5 seasons, or building on a pre-established super-club to ensure its longevity; the opportunities are endless.
Career Mode receives regular updates from one FIFA entry to the next, and it's not hard to see why it's so popular. There is never a shortage of updates EA could make to the game mode, but as it stands in FC 25 it is definitely an improvement on earlier FIFA entries with the inclusion of Create-a-Club, and some refinement over features that were buggy during buy Fut Coins.