That's as may be, and especially true if you're playing them solo, but playing coop games online with friends, even "inefficient" ones are enjoyable social experiences that can be done even without being co-located, which isn't something that's easy to substitute with other activities.

I play games with friends and coworkers online that I wouldn't otherwise interact with much, and it helps us stay in touch with each other and foster a relationship that would likely otherwise burn out.

If I was playing the games alone, I'd maybe regret it over playing a different and "better" game, but I'd rather do inefficient things with friends than efficient things alone a lot of the time.