If someone would pay me a salary to make JJ2 levels full time as a profession, then I'm sure I'd take the time to draw my own tilesets from scratch. However, as that's almost certainly never going to happen, I have to make do with the free time I have available outside of my regular day job.

Realistically speaking, it would take me at least a couple of months of solid work to draw an original tileset that is on par with Nick Stadler/Agama's tilesets. My free time is limited as it is, and if every level took me months to produce then I probably wouldn't be finishing very many at all. I actually enjoy the challenge of taking old tilesets and finding new ways to use them.

Of course I'm all for people creating new tilesets, but I don't believe we should gatekeep people who are happy to make use of the plethora of existing sets out there right now.