Software correction is part of the photo workflow nowadays (warts and all).
It does not need to be on-camera.
On my LR, when I import the RAW files, I load in the preset with the lens correction turned on, and there is no extra work at all.
But like the samples shown above, often, its an artistic call with the vignetting.
I end up adding it to a lot of my picts actually.
I've tried the Tamon 28-75/2.8 on the K1 (actually it was my copy which I sold to a friend when I went all primes)
f8-f11, at 28-35mm for landscapes, its good enough that I did not find a issue.
Wide open shooting, its more center sharp (as with most large aperture lenses, except the more modern ones)
Certainly a viable option imo.
However, 24-70mm lenses make a big difference imo as the 24mm end really can serve as the widest lens vs 28mm.