Disclaimer: I do some work for one of Gmail's competitors.

Of all the stuff Gmail imposes on the rest of the world, requiring proper sender authentication was a good thing and we've helped thousands of senders set up proper authentication because of it.

Forcing the issue finally got rid of the ridiculous practice of ignoring SPF/DKIM failures and just setting the DMARC record to p=none.

None of this changes the fact that Gmail is a problem for so many other reasons, but this specific imposed change was a net benefit for the entire email ecosystem.