In reply to MelvinWaggg:
Grades definitely shouldn't take into account accessibility.
They are literally comparable in difficulty, that's what grades are for.
one happens to be super accessible, easily workable longer problem (moves are likely to be easier individually) the other as described in the interview is much harder to get in good conditions and is a short series of super condition-dependent moves.
You do get regional variations in grading because people can only suggest grades based on what else they've climbed, but 8b+ will be comparable to 8b+ regardless of style, people just tend to have a preferential style which will feel easier. An 8b+ slab is still 5 grades harder than a 7c slab in the same way a steep limestone 8b+ is 5 grades harder than a steep limestone 7c.