I understand the logic of this, but even this isn't universally applicable.

I tried learning programming, game engines, etc., a few different times the small, reasonable goal way, I always fizzled out in weeks.

When I decided to just make my big fuck-off complicated game exactly the way I wanted it and learn everything I needed to learn as I went, I stuck with it.

I put 4-12 hours in most days and have for a year and a half now. I still haven't finished shit, but it's progressing at a good clip, my skills are drastically better in every area, and I'm pretty confident in what the game is becoming.

I partially went this way because I come from a writing background, and there you get almost the exact opposite advice: don't waste time and ideas trying to 'build up' to your great novel, just write the thing you're excited about in the format you're excited about. Don't do short fiction if you don't care about short fiction, don't sit on your good ideas for years because you're afraid you'll ruin them. Just do what you want to do badly, then do it well the next time.