I would agree on your point here, in some ways. Algolia is a limited search; there's a lot of things you can't do on the fly (that you can in, say, SOLR). However, the onboarding (as noted) is pretty good. It's really easy to get started using it. The learning curve is much lower and so, too, are the capabilities. If you don't need those extra capabilities, you just need to get search available, it might be the right thing.