For me speed chess is nothing more than a way to pass time.
Various chess benefits

Hi! My name is Lauren Goodkind and I’m a respected chess coach and chess YouTuber based in California:
https://www.youtube.com/channel/UCP5SPSG_sWSYPjqJYMNwL_Q
For blitz and bullet, it's just simply a fun way to play a full chess game in a short amount of time. From time to time, I make careless mistakes and sometimes mouse slips, and I am okay with this.
For slow daily chess, this is a great way to really think about your moves and calculate. This is what you really can't do in a blitz/bullet game.
I hope that this helps!
I know they all have their pro’s and con’s-
What are your thoughts?