I've had this bite me in the ass on many projects too, but I still agree with the parent. When I get an idea I get a rush of motivation to implement it. If, aft

I've had this bite me in the ass on many projects too, but I still agree with the parent. When I get an idea I get a rush of motivation to implement it. If, after that rush is over, all I have is a document, the motivation isn't coming back and the project isn't getting finished. Starting with a mostly-functional MVP means I can show it to people or use it myself, which gives me the extra motivation needed to make it less hacky/more maintainable/perform better/all the other things, that I could've thought about in the planning phase. (I just went through this cycle in the last month or so actually - I got pissed off at the state of public transport apps after I missed a train, so I decided I should make my own. I made a buggy hacked-together web app, started using it daily and showing it to people. Every time I used it, it made me want to work on it more, so I did - rewrote the backend to cache and segment data properly, made the map run at a non-sideshow framerate, made the icons consistent, started building a native version... It's actually getting close to something I'd call "good" now. Knowing myself, this would never have happened had I started off with a specification or even a mockup)