This is coming from a PvE perspective, & these thoughts are not all my own
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Sundial is the SoFr of defensive permanents, in that it's so cheap that you're getting the better trade even when the opponent brings PC. It's Fog with cycle. Only decks that shouldn't use dials are creature rushes
Compare them to Dim Shields. The latter takes up a shield slot
A draw is worth 3-4 quanta. Dial's are useful for their effect alone, so the Hasten on them shouldn't come at a discount
You'll be hard pressed to come up with a DG grinder that isn't reliant on dials. Long term I'd like to water down DGs to allow more diverse options against them
The argument to keep them this way is to say that they're an autoinclude which props up an archetype. That archetype seems to be "not rush". EtG's deckbuilding ruleset doesn't interact well with autoincludes