If your problem occurs because of accidental zooming with two fingers, then there’s a solution for you.
You can zoom map with just one finger (I use thumb) – do almost a double click but instead of releasing the second click, hold it pressed. Now as you hold it, just move thumb up and down to zoom in and out.
It’s a feature I discovered accidentally a few years ago, and in my experience pretty much no one knows about it, but once shown, everyone finds it extremely useful.
The other setting I'd love to see is to switch off re-framing. Let's say I select a destination, then I'm curious how long it will take to get there, so I select directions. Then I scroll around a bit to see other things nearby and spot something interesting. I tap on it, and try to get directions there too, except directions is already active, so I either have to go through the rigmarole of "add stop, delete the other one", or press the back button a few times to come out of directions. Except when I do, Maps first zooms out to show my entire route, then zooms back in to the original destination, and now I have to scroll around and try and find that second thing again. I'd rather it just left the zoom alone, and let me choose where I want to be looking. Sure, have a button to frame what you're currently looking at if you want, but stop jerking all over the place.