Just my humble opinion, but I believe most of this is due to spray/airbrush coloring. There is no penetration. Yes, you can get a nice even color....on the surface.
There is nothing underneath. So when scratched or scuffed, raw leather is showing through.
I would ask where you are. Rocky Mountain Leather carries some very nice European leathers. If you are Stateside there is no reason to go to all the expense of ordering from overseas.
Leather Tools & Supplies (rmleathersupply.com)
Plus one on the blue tape, never had an issue with it not sticking. In fact, I had one brand (I don't recall the name) that was very difficult to remove.
Very nice. Oak leaves are my favorite to carve. I had one of those little pistols for a while. But due to a deformity caused by an injury, the slide would slice the knuckle of my thumb every shot. I sold it to a young lady with much smaller hands.
I can't speak to knife sheaths, but chrome tan will take the bluing off of firearms, and latigo, which is combination tanned, will corrode brass and copper. So there is definitely something about chrome tan and metals.