Rivians do not have a great reputation for build quality at this point. But a lot of people who own them still love them.
On the price difference, it is rapidly going away and already for all practical purposes nonexistent in some cases.
A Chevy Equinox is available as both a dinosaur burner and an EV. The EV version lists for about $2000 more. But dealers often give rebates and discount for the EV which brings the costs even closer. Yes, the Equinox is a POS and I kind of hate them. On the other hand, comparable Subaru models run about the same price for EV or non-EV versions. Because of all the trim variations it is harder to make a direct comparison there but generally the costs of comparable models are within about $3000, with EVs sometimes being cheaper. And again, dealers in a lot of cases still offer generous discounts for EVs.
As a personal example, the 2026 Subaru Solterra I bought in February listed for $39k. I got about $6k in discounts to take it off their hands. A comparable Subaru Forester lists at about $41k, although I have no idea what discounts they would give on that model.