I can respect that. I basically came to the same conclusion regarding most PvP games/modes.
If I'm playing a game to have fun, and I'm not having fun, why am I still playing it?
My online friend group never really saw it my way unfortunately, but it always amuses me when we hang out in voice chat and they're getting biblical-levels of salty in a match while I'm just chilling and playing Spyro or something.
That being said, it sounds like she'd effectively turned the game streaming into her job. That'd sap the fun out of anything eventually.
I went through the same thing you did when I first quit Dota years ago. Lost contact with a whole group of people - several of which still play - but I just wasn't having a great return on my investment in terms of fun/hour.
It's possible I'll come to the same conclusion with Deadlock, though I'm still willing to try a bit since it's very mechanically fun to play.
I'm not sure if we'll see Deadlock introduce the same features as Dota, but if they do, I've found Dota's casual modes really great for low-stress, fun games. The difference maker in Dota compared to a lot of other games is that SBMM is still used, but less strictly and its all hidden so you (and your friends) can't fixate on it but also don't get stomped every game. We'll have to see how Deadlock's development pans out, but given that its Icefrog and Valve working on it, and they already seem to be working from lessons learned in Dota, I think theres pretty good odds.
Honestly, perfectly understandable that she would want to quit. Tons of content creators burn out after making the same type of thing day in and day out. Walking away when it's not fun anymore is better than sticking with something that makes you miserable.
Mods are a fun way to extend the lifespan of the game almost infinitely, but Bethesda is on the way to kill the experience with the Creation Club and other shenanigans.
I'm aware that people think that, but for many people like myself, there is no possibility of mods making a game infinitely entertaining. At some point games in general got boring for me. I have to take breaks and find unique games to keep my interest as it stands.
There are some games that can approach that level of entertainment. Something like Minecraft may entertain some for tens of thousands of hours because of its sandbox nature, and Crusader Kings games can also eat years of one's life because of how different each game/story can be.
But a game with a pre-written story and an immutable world has a fairly short shelf-life for most people.
Makes sense I hop to a new game after I finish. Looked to buy new games to play when I was little for variety. Never bought skins people these days go crazy about since that's money I'd rather spend on new games.