You must have not worked with small non-profits with zero technical expertise and zero budget for hiring a consultant/permanent paid staff. Heroku is overcomplicated, and Docker/static sites (or the command line/running a server of any kind) might as well be alien technology. Some orgs know just that little.
I don't see how PHP fits into your example either.
Who is writing the code in the first place? They're uploading existing code to a shared host through FTP but then who wrote the code? Is it a prepackaged Wordpress? But then Wordpess hosts already exist.
If the developer is giving them a zip to upload, why can't the developer handle the deployment as well?
You moved the goalposts so far that the example doesn't make any sense anymore.
