lol...i will buy ps5, but later - mid gen, I do it every gen, I have had every PlayStation console starting with ps one, I own PS4 pro and use for Sony exclusives only, I even own ps vita, still have my ps2 and owned 2 PSPs previously (my PS3 was gifted to some kids in my family couple years ago), all of these with lots of games, so I am heavily invested in Sony ecosystem as Well, And yes. I own Xbox one x and a gaming pc, but Xbox is by far the most used gaming machine in my household, but I do play on everything, I recently repurchased games cube as there are some Nintendo games that I love to play. It Is not all black and white.
I played PS4 Spider-Man for like 30 minutes, still have it but cannot force myself to play, Horizon, I have got a copy but haven't played it yet, as it is not one of those games that I feel urge to play, I will play when I have got some spare time (which in my case is a luxury), I am not a big fan of sim racers, so GT doesn't appeal to me, one of my favourite Sony exclusives is WipeOut, it is my personal taste in games, and based on that Sony event wasnt appealing to me, the games their shown are not exciting for me. They have not shown one game during their event that would make me buy PS5 day one. It is my personal taste.
Re. your question, there are multiple reasons, but if I have to list some, these would be;
I tend to play mostly 3rd party games, thus I prefer more powerful hardware (I play on 4K since circa 2017)
I have Game Pass Ultimate subscription and lots of digital purchases across Xbox generations
I prefer xbox game pad