I’m with you for the first part. Balance is important. But I would estimate for >90% of players, the expectation is that a well-flown dragon - let alone a mythic divine - should be able to lead against a defended base. And that at least for Plat on down, that a well-flown dragon - let alone a mythic divine - should be able to solo (or come pretty near to it) against a defended base, barring an excess of hammer-spam.
At least in Gold and Plat, it’s rare that I saw a battle that wasn’t
A) All the dragons dying without doing much damage
B) A single dragon doing most of the damage, needing only some minor cleanup (say, farms)
C) A single dragon soloing the base
And “A” mostly only happens with players who attack a defended base that’s 100+ levels higher, or players who have no idea how best to use their dragons. Maybe it’s different for you, but at least where I’ve seen, a legendary divine that can’t lead against a defense - and doesn’t have a good chance of soloing - is considered crap. Let alone a mythic divine!