Doing credos looks fine up to 5th credo, 5 CREDO that's what you need to unlock Cave Hermit, Blacksmith, Herder and etc credos (end-line credos)
And 5th credo require you only 10 quests per line (50 quests summary) what pretty okay if you even do madness credo like mystic with his experience event wich you must reroling coz u experienced this event 1 hour ago.
I know that you Jorb like experience event quest, they're make lore and game very atmospheric, we don't say that we doesn't like this, we just want to say THAT little insane when you must reroling all type of this event quests and you can do something with it, make less exp from event, but more event frequency, for example: 100 exp, but let it proc every day, not a weeks, or make cd timer on events of local resources.
But my discussion mostly not about Mythic credo or exp events.
I just want to say that credo making for hermit without alt's or friends very unfair, coz we have 21 credo right now, that 44 quests per line on last credo (220 quests summary) and imagine that this last credo will be mythic where you must reroll all exp event quests.
Stoping increasing number of quests on 5th credo (50 quest's summary) seems fair for all and mostly for people without alts/friends.