Rivian is cranking out R2s which apparently would be profitable from the start. The R1 is still selling quite well (and outselling the Gravity YTD). They have financial partnerships with VW, Amazon and now Uber - with their deal for the R2 worth more than the one with the Gravity. Their financials are almost strictly better on paper. So is their software. They also have way more service centers and showrooms that are expanding monthly. Lucid vehicles may be BETTER but I'd argue the ownership experience of a Rivian is better overall.
As for build quality, that is a matter of opinion, but for the price point, it is above average. My wife has a new Model Y Performance and it is a better vehicle than the R2 IMO but for those seeking an alternative and want nothing to do with Elon, the R2 is the only true other game in town. For under $60k, the R2 and MY Performance are absolute bargains for all that they offer.
Product quality goes a lot further than material choices and fit and finish. Software, availability of service, reliability and company stability also factor in. You can dislike the Rivian vehicles, but the companies aren't even in the same conversation anymore. Rivian said R2 will be released in 2026. It's here and being delivered every day. We don't even have a picture of the Cosmos yet. I just don't see how one can be more worried about Rivian than Lucid - and this is coming from a fan of both.