Only explore the TB if I want Tier 2 dust to ascend a new 6* but even that is hard to justify or find motivation for. Otherwise I simply complete the top 2 for the deals when content comes around.
Always do the lower ones for units and daily points.
I auto-fight the lower difficulties for the units and to complete the daily super event and for this month also to complete the voting objectives. Haven't touched Cavalier or TB difficulty in months.
I did it until last month, but probably won't from here on unless the rewards are worth the time and effort (even considering the ascension dust and xp). Some may still see value in the total rewards, but if they keep on playing it for low value, we' won't get a rewards update.
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Always do the lower ones for units and daily points.