> The entire Python community was in pain over Python 3 for 10 years

Sorry, but that's fiction. Yes, lots of projects (still the minority) simply didn't upgrade, but it's not because they tried and failed. It's because they never prioritized it.

> Here's a pain story about a 2 to 3 migration though:

Consistent with my claim:

> Probably less than 1% of projects had serious issues with the migration. We just hear of a few popular ones that had some pain and assume that was representative.