I think this also depends on the particular world you're using -- if, for example, you're basing your campaign world on Greyhawk, then it makes perfect sense for the high priest of Celestian to be both very high-level, because that's how Greyhawk traditionally works, and also have Find the Path prepared, since that spell fits very well with Celestian's portfolio.The spells (or classes, or races, or whatever) in the PHB do NOT necessarily represent what is broadly a part of any particular world.
And it feels like a lot of folks are focusing on the limited number of 6th level spell slots possessed by PC class casters and forgetting that casters are not limited in the same way in the number of 6th level spells they can prepare -- a caster might well prepare a spell she has no reason to assume she's going to cast, just because the utility of the spell when the circumstances are right is so good that the downside of not having it (or having to wait until after a long rest to get it) is worth the prep slot.
Neither of these points really have much to do with the question of 'is 5E Find the Path weak compared to other editions', which I agree with. But since you can't actually use any of the older edition spells in 5E, that seems about as useful to me as arguing about how 'weak' Shock is in Magic the Gathering because
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Pauper