[Cthulhu_]

Second, what were the alternatives at the time? I mean I'm sort of a web developer and work in React and such, but do I feel regrets about having spent a year and a half building an application in Backbone? No, because I know back then, React and Angular and such were non-existent.

Besides, most software, especially front-end, has a very short half-life and it's not unreasonable to believe you'll rewrite the whole thing every 3-5 years anyway. Write front-end code like you'll throw it away, write core back-end like it'll drive your business for the next decade or so. At least the database.

(Of course, as I found out later, Angular had been in development for years before work on Backbone had even started, but it wasn't a google project or well-known at the time).