This is just wrong info. Search HN comments from ‘craigkerstiens, an early employee. Significant innovative product development continued for a few years after the acquisition.
If the security incident a few months ago wasn't a clear "we don't care about Heroku" then I don't know what will wake some people up.
https://www.craigkerstiens.com/2022/05/18/unfinished-busines...