Don’t really agree with the history.
MRI ruby had always had a fast startup time and was not originally created for the web... it’s more like a “better” Perl cum toolkit for C/unixy stuff- ironically what python became more popular for despite python not originally being written for that purpose.
Also in the old days of the web.. CGI was literally spawning a process per request.
Regardless it’s bizarre to think nodejs pioneered startup time... Ruby, lua, python, and good lord Perl would really like to have a word with you for starters.
Java was really more the exception.
And I’m not sure it’s true that these serverless platforms are spawning a new process per request ... but wow what is old is new again. Sounds like you’re describing inetd (look it up). Nothing of what you’re talking about is 5 years. Try 30-40.