I used to work for a guy who often used to say to me (as the head of tech-y stuff) "customers don't care what it's running on if it works - it can run on wet string and sellotape as long as the customers are happy it's doing what it's supposed to".
I used to laugh, but we both agreed that he was right. If you're selling anything, remember it's what the customer cares about that matters, not what you care about.
That's true to a point but in my experience clients can be fairly insistent about using a particular technology, even if it's a bad fit for the problem.
I guess it's probably because they know that once the project is done they can hire one of the thousands of $8/hour teenage "Wordpress/Joomla experts" for maintenance.
Those are clients you probably don't want to work with anyway. The best clients are usually the ones that have a problem and need you to solve it for them, it's then up to you to use your expertise to deliver that solution. You are the professional and similar to lawyer or doctor it behooves you to do what's in the best interest of client when it comes to your technology choices. Plus if they know the technology they want to use (and often how much it should cost) there's an entire race to the bottom market that addresses this--freelance/gig boards.
Well, yes, I guess there'll always be clients like that. I've generally been quite fortunate that I've been able to be fairly selective in life about who I work with/for, and I've rejected as many clients (more in fact) than have rejected me.
Saying that though, in those kinds of situations I do usually try and have a conversation with them about why they want to make those calls - they're paying me (or wishing to) for my professional expertise, and part of that is about educating people around surface choices which seem like a bargain but come with potential hidden costs and disasters. Some can't be helped of course :)
I used to laugh, but we both agreed that he was right. If you're selling anything, remember it's what the customer cares about that matters, not what you care about.