Until more client gets burned with a cheap option that becomes expensive to maintain they won't care. Many clients (across the whole industry, I don't know your clients which could be very different from average) will not get burned as most problems will never get that complex. However most clients have a lot of small problems that are quick to solve meaning that most developers spend their time on the small minority of clients that have complex problems where this matters.
I think part of the problem here is the "market for lemons" thing: The client can't tell the difference between the short-term-cheap-long-term-expensive option and the short-term-expensive-long-term-cheap option, so can't trust that the expensive option will actually save them money in the long term, rather than being a short-term-expensive-long-term-even-more-expensive option.
Consider getting quotes to re-plaster your house. One builder quotes you £2000, another £4000. Now, is the first builder giving you a fair price and the second builder charging you extra because you don't know what a fair price is? Or is the first builder a "cowboy" who's going to do a terrible job you're going to regret, and the second a craftsman who's going to do an excellent job you'll be happy you went with? Maybe you happen to know enough, but that's not where I was when we were renovating our house.
And consider that the client isn't sure they'll even need a website in 3 years; maybe this new venture will crash and burn well before then. Then we'll be doubly glad they didn't invest in a website with the equivalent of a 10-year guarantee.
The amount of times I have advised clients to not use something like Wordpress to just end up having to use a page builder like Divi hurts my soul.
At the end of the day the majority don’t care about things like carrying bloat/legacy code, rigorous testing patterns, using modern tech stacks or typesafe codebases. They simply want you to “make thing go brr”.
I can advise until I am blue in the face but the reality is that at least 90% of all my clients want the quickest and cheapest option, resulting in me barely even scratching the surface of my technical abilities.
I guess the main thing from a business perspective is that I’m getting paid but, at the same time, ouch, my feels.