For the most part, it's just my style. It's my forte and it's normally what I'm best at due to it normally being an in-demand role regardless if it's braindead easy or requires some effort to accomplish.
I like holding enemies off of party members and friends and the feeling of "you're stuck here with ME" without it being too overpowered with virtually zero effort (looking at you, WAR).
But there's the caveat. While it is what I enjoy most in MMO's they stripped basically everything that made it enjoyable for me in Shadowbringers (skill-ceiling and fun gameplay) and replaced it with nothing. While it still is my main role in any given game I play if I can make myself that way, I've since branched out into dps more in ffxiv because they're still somewhat enjoyable for me to play currently.
TLDR; Tanking is what I excel at and like the most flavor-wise in MMO's, for better or worse