Yeah me too. The first couple of times I used a sequencer on stage i really felt like a big cheat. The conservative rock guitarist in me hates sequencers
On topic: Nothing helps me finish songs like a hard deadline. Otherwise I’ll just keep changing small stuff in the mix that no-one will ever hear, haha.
Besides the limitations of my instruments and machines I like to create limitations or rules for myself to help get more creative and find new ways to make music.
For the songs on my first release I had a few rules:
1) no snares
2) no hi-hats,
3) clean guitars only, no drive
4) no synths
That was 5 years ago and my newer work is filled with snares, hats and drive and I use more synths than guitar these days so maybe I’m compensating
Rules that I use nowadays are things like
Start the writing process with a drum pattern (I usually start with a guitar part, even though it may not even make the final mix)
Write a song in a weird time signature like 5/4 or 7/4
Write a song with a signature change like from 4/4 to 5/4
Use a maximum of 10 tracks to create a song
Reading the Making Music book from Ableton helped me a lot too: https://makingmusic.ableton.com/ Good stuff in there!