Well, if the OP came here intending to gather diametrically opposed statements of “fact” he wasn’t disappointed.
So, now that it has been determined that nothing here will tell him with any surety what he needs to know, since our our very help contradicts itself, he needs to just buy one and decide for himself.
I own three G1s and two G2s and here is my opinion for what it’s worth: If you read and follow to the letter the instructions regarding focusing in the manual, you will have zero problems with the AF, or missed shots. None, zero, nada. If you just pick it up and start pressing buttons it will be hit or miss. I have no problems at all with missing focus with either the G1 or the G2. The G1 is slower than the G2 and both of them are slower than a Nikon D850, but both are as fast as an M3 if not faster. Speed and accuracy are two separate things. They are not lightning fast, but they are fast enough to get whatever shot you need short of burst modes. People complain all over the web about the AF, but I don’t think it’s the camera which is the problem.
It’s actually the manual focus functionality on these bodies I find problematic and unsatisfying, and tend to ignore it.
The lenses, even the “worst” one like the 35mm are as good if not better than any lens Leica ever made up the the time point these bodies were made. Mostly better, like the 21, 45, and 28.
The viewfinder is not “squinty”. See an eye doctor. Learn how to hold the camera up to your face. Something. Criminy.
Worried about “electronics”? I have never had a moment’s problem, in the years I have owned any of these, but, yes, I am as paranoid as the next guy. It’s why I own five of them. Belt and suspenders, problem solved. You can buy four G1s for the cost of a user M3.
They are not as nice as fondling objects as either barnacks or M bodies, but they are not bad, really solid. But for taking photos and getting many more keepers out of every single roll, they will eat Ms and HCB for lunch. Every single day. AF and AE might not be “pure”, but they get results.
I’ve just consigned myself to the fifth circle of Hell for all eternity, but there it is.
To the OP, just buy a G1 with the 45, a green label if you eventually intend on using the full complement of available lenses, and RTFM. See how you get on with it yourself. Internet advice is just spread too far all over the map to be able to know what to do based on what others say, because others say all manner of things.
