As someone that was there at Heroku after the acquisition, I don't think you can state that since the acquisition it's been consistently downhill. There isn't much debate that things have stagnated in the last 5-7 years which is a longer story on why probably.
Some examples of innovation that happened and were launched after the acquisition: buildpacks (at the time of acquisition Heroku was still Ruby only), Heroku Postgres launched forks/followers/dataclips all after the acquisition, review apps came several years after. Salesforce may have had an eventual hand in it, but there was still a lot of innovation happening due to the folks there in the near to mid-term after the acquisition for several years.
All that said, very excited for the new crop of players in the space. There are a number of companies trying to be a cheaper or more stable Heroku. Personally I'm excited about the ones that are taking their own unique approach. https://www.fly.io and https://www.railway.app are two that to me seem to bring their own perspective vs. just trying to recreate Heroku as a carbon copy clone. There are a number more in the jamstack space that have become staples such as Netlify and Vercel which are also doing great things.
Some examples of innovation that happened and were launched after the acquisition: buildpacks (at the time of acquisition Heroku was still Ruby only), Heroku Postgres launched forks/followers/dataclips all after the acquisition, review apps came several years after. Salesforce may have had an eventual hand in it, but there was still a lot of innovation happening due to the folks there in the near to mid-term after the acquisition for several years.
All that said, very excited for the new crop of players in the space. There are a number of companies trying to be a cheaper or more stable Heroku. Personally I'm excited about the ones that are taking their own unique approach. https://www.fly.io and https://www.railway.app are two that to me seem to bring their own perspective vs. just trying to recreate Heroku as a carbon copy clone. There are a number more in the jamstack space that have become staples such as Netlify and Vercel which are also doing great things.