“No reason “
Suit yourself. I use what is specified for a particular vehicle. Why try to outsmart the engineering team that matched a particular part to a particular vehicle?
Look ok to me, and like it did it's job. I don't concern myself with some wave which is purely aesthetic and has no effect on function. Even the lauded made in Austria Mahle spin on linked HERE showed wavy pleating on dissection.
As for using the longer filter application, your vehicle, your call. Where space permits I always use and would use the 7317, 4386 filter applications in place of the 6607, 4967 respectively. Also same specs, just somewhat longer and more media area.
I agree, as long as the oversize filter has the same specs as the original filter, and the extra size doesn't interfere with anything underhood, it is safe to use.