very common.
Even after my first procedure when I tilted my head back it was like you could see a bald head despite me having my entire frontal third transplanted. I could see a hairline outline yet I looked bald in and around the transplanted area. As for the pictures you provided, additional work is the only way around this outcome. Some of these individuals did not have good transplants. meaning the doctors were using the wrong graft selection at the hairline which gave this see-through pluggy appearance.
But I would like to confirm that these doctors will promise you the world, but it wont change anything. An area such as the hairline will require indefinitely additional work. Some people are able to get away with one pass, but most will almost always need an additional transplant over the surrounding area.
biggest issue you will find is wrong grafts being implanted at the hairline. Improper devises being used during dissection, and graft separation. In order for the hairline to look natural it must be almost all single hair grafts, yet doctors are implanting doubles which gives that pluggy grown out look, instead of a feathered hair line. Again, doctors not providing the right tools to there staff with high magnification, which would eliminate this entirely. When you put a 2 hair graft t the hairline, you will have a pluggy look.