Your reasons for DIY make tons of sense.
As it happens, it’s not where I prefer to put my own time and efforts.Maybe it’s laziness, or the amount of time I work or whatever, but when I have time to relax, listening to music (or watching a movie, or going out to dinner...) is what I want to do, not build speakers.
As you indicate, it’s all about the individual and what he likes doing. My pal built his own back deck. He enjoyed the process and was proud when he finished. I get it. But to me every description of his process sounded like a chore, not something I’d get pleasure from. Same goes for some geek-heads who like to build their own computers. If that's what interests you, then it makes sense.
But I’m not a DIY or handyman type, more an artsy fartsy, so there ya go....
I really appreciate the knowledge that some DIYers like yourself bring to the rest of us numbskulls.