I too recently picked up FIFA 21, but I am afraid that while yes the graphics on my PS5 console look great, FIFA 2021 is an arcade game designed to be played with really short halfs.
I like playing CPU vs CPU games because these types of games showcase or expose just how good or how bad the AI is and I am afraid to say that FIFA 2021 has taken quite the step backwards in regards to its AI game play. The last FIFA game I bought dates back five years now and it was FIFA 16 (for the PC) and while the graphics are not up to what we expect these days, the AI of FIFA 16 was far superior than what is used now. I recorded the following video five years ago and posted it on YouTube as an alternative to the 2016 UEFA Champions League Final and if you can tolerate the inferior graphics (watching it on a large screen is painful, it is recommended to make the screen smaller) and have the patience to sit through one hour of game play (two 20 minute halfs), you will see what I am talking about in regards to the superior AI game play of the five year old game.
https://www.youtube.com/watch?v=krCMJk_xFoY
Besides the impressive graphics of FIFA 2021, the only thing I find salience with my recent FIFA 2021 purchase was that I did not pay full price for it. I was lucky enough to get my copy while it was on sale.