I did this for years. Yep, it works enoughish, but I'm so much happier on a password manager now, and it's pretty fun to see the managed passwords having so much more entropy than even the most obscure things I was algorithmically generating. Also, the speed of using a manager is great. Somehow I ended up with multiple Ticketmaster accounts (from using a different email address for some one-off season tickets that migrated into TM later). I think the moment I realized I wanted to change to a manager was when I was walking up to a concert and realized I hadn't downloaded my ticket. I got into TM and realized I needed to switch accounts. So then I'm trying to walk and type my big fucky nerd-assed brain-generated password on mobile, fat-fingering the touchscreen keyboard, almost locking myself out of the account when I just want to get into the venue and relax. Later, that first moment trying an integrated pass manager and effortlessly switching between accounts, each with far stronger passes than I would have remembered, limited only by the loading speed of the site and with virtually zero chance of locking myself out... that really made me feel like fancy Pooh meme.