I wonder whether this could be a touchpad malfunction, causing phantom clicks that move focus. To diagnose, you could temporarily disable it and use an external mouse.
Non-Mac OSs don't know how to turn this GPU on out of the box, so it just sits there without bothering anybody. But, for some reason, MacOS turns it on and it craps the bed, rendering the machine unusable.
Apple ended up replacing the mainboard in a free out-of-AppleCare repair. I never had the problem again and I used the machine regularly until about 2018.
Whether or not external micr suck on MacOS doesn’t really matter. The objective was to diagnose an issue.
I use a trackball for RSI reasons, in order to get across the screen in a single flick means high sensitivity, mouse acceleration is absolutely needed to be able to make small movements. This makes my scroll wheel useless because a single scroll moves the page about 1/10 of a line
(except that my latest one has just suffered catastrophic battery failure)
My sister in law gave me her G700S to fix the main button microswitches, and she convinced me that it's the apotheosis of the design - it's what should have replaced the Performance MX. No soft-touch plastic, extra buttons, and the higher resolution sensor. I'll probably have to get one off eBay.
Edit: also all of the Masters have non-user-replaceable batteries.
Yes, but the battery is standard and easily replaceable.
My main gripe with the G700s is the weight, although it's not much heavier than the mx master 3. It also helps to have a great mousepad, or else I get tired of pushing that brick around. There are also aftermarket pads if you use it on the desk and they wear. I haven't tried any, though, my pads are still fine.
The G604 that the prior post referenced uses a single AA battery, so also standard and easily replaceable.
Another option which sidesteps the Logi Options crap is Logitech "gaming" mice. These have an integrated memory that actually remembers the configuration set by the driver. So, you only have to put up with the shitty experience once, and then the mouse remembers those settings wherever you use it. Some models can actually remember multiple setting sets.
One of my best mice is a G700s. I haven't used the Logitech G crap in like... ten years? The mouse is still going strong. Its only issue is that it goes through batteries like a hot knife through butter. I like it so much, I actually bought a second one for work. Got it used, since they weren't making them anymore.
https://support.logi.com/hc/en-us/articles/37493733117847-Op...
Which would only happen if you are using it wireless.
It happened to me this morning.
That's not macos fault in this case, it's just that Logitech mouses (MX Master at least) doesn't act well at all without driver. Like, for scrolling, it's like the mouse is sending raw smooth scrolling each time you just touch the wheel and without the driver that presumably fake it on the computer side, there is no synchronisation between your actual scroll and the steps you physically feel in the wheel.