Someone starting from scratch can build a HiFi system optimized for streaming for no more (and probably less) than the cost of system optimized for vinyl. Less than $2K or so probably can get you a decent set of used bookshelf speakers, an integrated amp, a Bluesound Node, cables, router/switch, and a media service subscription. At that point you can access pretty much all the world's music. Searching for whatever you like is a breeze (usually). There's no messing around with dusty/warped/scratched records, worn needles, or stretched turntable belts. Setting up a streaming service isn't much more complicated than setting up a cable TV service.
On the other hand, if you're at that point with a record-player system, and truly just starting out, your biggest problem is that you have no music to play. Building an LP collection could take you years of searching . Your library will ALWAYS be far more limited than what you could get immediately for about $20/month (about the price of 1 or 2 new vinyl albums per month, average eBay prices). Unless, that is, you buy a receiver (integrated amp with radio tuner) and do all your listening to FM or satellite radio. That could be a pretty good way to go if you don't obsess about sound quality, you don't need to own what you play, and you are content with letting someone else choose the playlist.
Once they have such a starter system, whatever kind it is, why do some people obsess about better and better SQ? You could ask the same question about all kinds of things. Food, clothes, etc.