Why the fuck should I care about the damn launcher?
DRM-heavy launchers have a history of spying on PC user activity, and of leading to malware infections. All well-known launchers, today, are DRM-heavy. (I would love tips on exceptions to this!)
DRM tries to control your PC remotely. There isn’t, and never will be, a safe way to do that without increasing the risks of outside malware attacks succeeding against you and your PC. In most cases, the risk increase is quite high.
Game launchers provide a trade-off between:
ease of installation and networking Vs
risk of malware infections
Each additional launcher brings a lot more risk, and slightly less convenience.
If it was just about the convenience, I agree - who cares.
Many of us have lost entire digital game catalogs, or had to rebuild our gaming rig, or both, due to a remotely hacked game installer/service/launcher. So many of us are incredibly bullish against adding one more installer/service/launcher to our gaming rig.