I love to see how active and vibrant the Rails community is. I used to be concerned about the viability of building new companies in Rails, since the ruby share of languages is so low these days. Based on the still-healthy community and the ridiculous productivity level that a developer can have with Rails 7+ (turbo, morph, stimulus) I still think its a fantastic stack to build a company with.
Sure shaving the last 10/10ths of having a SPA with simple API based back end gets the ultimate user experience and speed but that cost curve goes up significantly for that last 10th (if you were to compared to an 'old school' Rails app)
I can't even fathom what it would have taken to build our startups' product in say React + Node (as an example..) vs OG Rails SSR. I look at a "sort of" competitor in our industry, and their rate of feature development is ridiculously slow by comparison.