Claiming your listing does not let you lock it in the sense you are thinking of. It's also not very difficult to claim a listing that was already claimed by somebody else -- they will get an email asking them to challenge your claim, and if they don't respond you can take over the listing. That's how it worked a year ago, which is the last time I used it.

You can review edits in Google My Business. But Google will sometimes import a bunch of data from a data broker or some other source and bulk update your listings, which you then need to go in and edit again.

Google My Business is also very, very strict about rejecting addresses it does not think are real, which is a bit of a problem for businesses on newly constructed roads, or roads that were recently renamed. If their address normalizer rejects it, you just can't use it.

When you have a problem, Google's customer service is really, really bad.