Former Heroku employee. They just released streaming data connectors (https://blog.heroku.com/heroku-streaming-data-connectors) which is pretty cool.

They're maintaining the platform fine I'd say, which is quite a bit of work when you consider the frameworks and databases they offer.

As far as I am aware they had python 3 available a long time ago (long before the competition) and they have beta versions of some tools so you can test in advance.

Heroku pipelines are great and I believe they were added after the acquisition

It feels like Heroku has lost its market leadership. These days seems like Netlify is the winner.