> All of the most talented engineers at Heroku left
There are still plenty of talented engineers at Heroku.
I used to do architecture work and support for enterprise customers and I knew the whole support team. Heroku support engineers are all devs or former devs; I am surprised at how passionate they can be about their work (ex: Jason, who STILL keeps the subreddit updated in his spare time).
I do think there are situations where support can't help, but those are usually situations where Heroku is probably not the right place to host a service. They can't help you setup crypto miners on the platform, or to setup a redirect service. If you don't like how the platform works, they can drop in suggestions on what to change, but they aren't going to be able to implement them overnight. You might get ideas on restructuring your app to work better on Heroku, which I admit is quite frustrating for a customer; but limiting the problem domain is part of building a service like Heroku.
Heroku's support structure didn't have a half dozen escalations, which was good IMO.
If you run into an issue on the platform, there is usually the support engineer and then engineers who developed it. This might have changed around when I left (my team was mostly eliminated during the pandemic), so I'm not particularly up-to-date on recent changes. However, the system they had in place when I was there felt much better, as a developer who needs help, than the support I currently get from (large IAAS provider), despite myself doing work for a major customer of theirs.