It has never been about whether PHP can get shit done, it's that given languages that actually had formal design processes and make your days as a coder a joy, why would you move TO PHP.
There are simply so many other options.
The barrier to entry is higher if you want to run a site on something else.
That is the sole reason PHP is as popular as it is and part of the reason why it stays popular and powers so many of the internet's top websites.
Other reasons why it stays popular is that they really have improved it a lot over the years and knowledge on how to run PHP at scale is quite easily available. The community is improving along with the language.
Yes, the standard library is frustrating but that is a pretty minor inconvenience honestly. Every language has a frustrating part of its design. This wart on PHP can be fixed and there are some great recommendations on how to transition to a better std lib in other comments on this OP.
What is this really an issue for? I mean, sure, there may be more choices of low-cost low-feature shared hosts that support PHP than other languages, but its hardly as if there aren't a sufficient quantity of low-cost (even, in some cases, with free tiers) platforms for apps in a wide variety of languages.
Unless you are literally compelled to choose a host at random, the fact that a randomly-chosen shared host is more likely to support PHP shouldn't really matter.
So, choose the language based on the ease of the first 15 minutes of your startup?
I don't personally enjoy programming in PHP but the way people act as if it isn't massively important strikes me as obtuse and/or petty.
That's the lesson I'd love to see other ecosystems learn. PHP, by being very novice-friendly, has developed an enormous user base. How much better off would those people be if they had started with a language that was awesome not just for starting, but for the long term?
(As an aside, I'm throwing no stones here. My first programming language was BASIC, and it took me a long time to unlearn the bad habits it gave me.)
It's really more about the talent of your team than the language you choose to write your app(s) in.
