I remember recommending a non-iPod MP3 player that had a ton of customization options directly on the device. I regretted it because the person that bought it expected it to work exactly like an iPod plus the bells and whistles I recommended.
What is even worse for me - I myself make a tool then stop using it and later I cannot come back.
Like with the spreadsheets I did to manage stuff. If I don’t use it at least weekly it quickly becomes less and less useful.
But also they mostly served their purpose and it is time to use new one. Not everything has to be used forever.
I have a convenience tool I made for myself, but shared with my coworkers. I deeply regret sharing it because nobody knows how to use it effectively