I'm not convincing you of anything. That being said, here are a few of my favorite things about PC gaming:
1-Diversity of games. There are some serious gems that never make it to consoles and some heady strategy titles that just wouldn't work. Sure, you get the likes of Hollow Knight and Celeste, but what about more experimental games like A Mortician's Tale or Passage that don't fit into the console gamespace.
2-Backwards compatibility. I can play just about every generation of gaming on my PC with just a bit of effort. GOG makes a lot of it painless for modern systems but even those that require some tweaking are not too bad. As much as I love my PS4, the fact it has extremely limited backwards compatibility is a huge bummer. And don't even get me started on Nintendo making people buy the same game for each new console. Maybe their online service will change that but I love having my PC collection being there basically as long as I can keep everything backed up. I've got gigs of old and new games on my external drive ensuring if the internet ever dies I'll have my own mini-library of games to play.
3-I already need a PC. I already use my PC for browsing the web, writing, image editing, etc., why not also just spend a bit more money to make it a gaming system? Every PC I've build is cheaper than the cheapest Macbook on the market and can do far more than those laptops can. If you can buy a Macbook every 4-5 years, you can easily build a budget gaming PC. You won't be playing with everything on high with the latest releases a few years down the line, but it'll still give you the biggest library gaming has to offer.
4-Games are cheap. Too cheap, some argue. I have bought so many games for a buck or two and still haven't gotten around to playing them. Bundles, frequent sales, insane price drops and more make for easily the most aggressive gaming market. Lots of digital vendors competing has made it easy to stretch your dollars. I once calculated how much money I spent on average per game and it was $5.88. That's absurd. It's one of many reasons why I feel like I've gotten my value out of PC gaming as my primary gaming platform.