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constantly thinking about the details and what i want to change on each one is exhausting and borderline obsession.
About once a year i have a melt down, stop for a while then start over with a new build that addresses where i went wrong with the last. Wash, rinse, repeat.
I'm trying to make the shift from building bikes as a hobby to actually riding them for fun which isn't as easy as it sounds. Being happy and being able to ignore unfinished projects sounds like the OP has made it in life rather than something to be worried about.
Maybe you've reached a state of nirvana and now aren't trying to fill a void by worrying about building up bikes to silly perfection. I have 4 bikes in the flat, and constantly thinking about the details and what i want to change on each one is exhausting and borderline obsession. Money draining too. I think about the serentiy of slimming down to one nice road bike. Or the freedom of having one ratbike that I don't care about.
As long as you've not fallen out of love with cycling maybe it's a healthy place to be and you've 'arrived'.
I'm semi joking here. But also not really. I love messing with bikes but it is a commitment!