It might be 'bias', but if it was as easy to do this in other stacks, wouldn't we see hundreds of thousands of cookie-cutter/copy/paste sites in, say, .net? Or rails? Or node? That this is 'easy' with a PHP base speaks to the fact that many other stacks seemingly ignore the needs of many markets.

I seem to recall a perl CMS - was is movable type? - that required mod_perl. This certainly gave it a perf boost against other CMS, but the overhead in setting up and maintaining a mod_perl system, and dealing with making code updates, was huge compared to PHP. I think these qualities continually get overlooked, decades on.