I don’t know about others, such as Snapmaker themselves, but I use it because;
1: It works fine, why change and break what works for me.
2: Generates leaner code, saves a little on size and thus speed by trimming unused I indicators and such.
2b: Also doesn’t generate a thumbnail, which seems to break the serial connection (though I don’t use USB)
3: I don’t use any of the button functions, so the macros being wrong doesn’t affect me at all. I have a full repeatable origin setup so I don’t worry about having to move and set origins, etc. Any movement I need I can do via console. (Power user syndrome? 
)
I use it all the time, but since it’s a standard in GRBL, I hardly think about actively switching it as seen in your screenshot. I recently did a depth engrave with an A250T 10W + grayscale inline.
Is a Marlin thing. Normally G0 is just rapid machine max on a CNC platform, but in Marlin, it can be set differently, which can be a good thing, or a bad thing as seen above.