> I’d assume the goal in web development is the end product or service and not the means to it.

I don't think I agree. The end product's possibility to be exist at all depends on the mental health of your employees, how efficient they are, and what tools they use. Someone who is unmotivated due to using a language or a tool that is horrible will work only on work morale as a resource for motivation, and it's only a matter of time before that resource runs out, and they'll start feeling miserable and perform sub-optimally.

I don't have an opinion on PHP, although I've made a few cool things with it and enjoyed coding in it, so I don't think it's necessarily that bad.