I like Dart & Slough... I think you could steal a good development QB that at worst may have some trade value in 3 years if you find "the guy" in next year's draft.
Purdy has lesser raw talent than those two and he took his team to a SB. I would say those guys have much better arm talent than Hurts and he won a ring.
I think we all get caught up in wanting or expecting a plug & play guy like Daniels or Williams. They are exceptions. Even Mahomes sat a year. Hurts sat most of his rookie year. You can't tell me McVay can't take guys off that list and develop them and build an offense they can thrive in and a team that can support them.
I think we differ on the "at worst" part here. I think Dart and Slough at best would be good backups.
I have no clue where you get that these guys have better arm talent than Hurts (maybe processing?) so a bit lost there - really lost - but haven't watched any Slough games, only highlights.
I think you greatly underestimate Purdy as the lesser talent (Dart for sure can't even process 1/10 of what Purdy seems to be able to do) though if you want to make an argument that you should takes shots at QB somewhere in the draft, Purdy is a good example of that.
Edit: I saw that you wrote "lesser raw talent" and I'm guessing you mean tools, which yes, I think you could argue that but not sure how germane that is when a QB's ability to process, learn and execute and keep eyes up/move in pocket are the superior qualities.
Is it possibly that some of us are overrating about even taking a shot at these QBs because we have a need and not looking at them objectively and seeing that it's an incredibly low, infinitesimal chance that they become even spot starters in this league.
(Mind you, if we draft one of these guys, I'll convince myself they've got some sort of shot at being a long term backup!)