They have not pushed out any notable updates in a long time, bugs have remained unfixed for many years, customer support is unhelpful. All of the most talented engineers at Heroku left, the team now functions as an internal infra team for Salesforce. It's a zombie of a company.
The product and pricing are pretty good for small projects, but almost everyone outgrows Heroku well before they transition from "small" to "medium". The pricing model hasn't changed in many years. Dyno sizing hasn't changed or improved pretty much ever. Now that compelling alternatives to Heroku exist (Render, fly, even Netlify) there's no good reason to launch a new project on Heroku. Hell, even Elastic Beanstalk manages to give a decent experience for many folks compared to Heroku.
The product and pricing are pretty good for small projects, but almost everyone outgrows Heroku well before they transition from "small" to "medium". The pricing model hasn't changed in many years. Dyno sizing hasn't changed or improved pretty much ever. Now that compelling alternatives to Heroku exist (Render, fly, even Netlify) there's no good reason to launch a new project on Heroku. Hell, even Elastic Beanstalk manages to give a decent experience for many folks compared to Heroku.