heroku was never touted as an edge platform, where are you getting this idea from?
There have been many trends in software, some stay, some go, some evolve
Maybe you are conflating "edge" with "serverless" and over applying the latest buzzword? None of the technologies you have mentioned are "edge" and telecoms have been doing edge since before it had a buzzword.
It's all about deployment and running infra. The "edge" has a lot of complications, and while closer in spirit to the early internet, we gravitated towards centrally controlled compute because it is much easier to manage and maintain at scale. See other comments for why
There have been many trends in software, some stay, some go, some evolve
Maybe you are conflating "edge" with "serverless" and over applying the latest buzzword? None of the technologies you have mentioned are "edge" and telecoms have been doing edge since before it had a buzzword.
It's all about deployment and running infra. The "edge" has a lot of complications, and while closer in spirit to the early internet, we gravitated towards centrally controlled compute because it is much easier to manage and maintain at scale. See other comments for why