Like
>>8558626 >>8558698 claim, plastic modeling never runs into this issue, The backlog is eternal because you can always aim for a new result or try a new technique. I do Gundam, other franchise and have a few military models. Modeling involves the initial out of box build, painting, detailing, custom part making, kitbashing all to whatever degree you choose.
I personally airbrush paint, kitbash, have minor scratch building expereince and so on. Just the other day I learned to install magnets into the kit for the first time to attach parts without pegs so no contact is needed. It can make painting easier, and add strength to connections. Pic related, I mainly hang in the /m/ gunpla thread and visit the /toy/ one too.