This is very much on-point. Once I launched 5KMVP, people no longer focussed on the tech choices I made. They do ask what my stack is - I think because most of the crowd I cater to are more savvy and are curious - but for the most part they just care about getting an MVP at the end of the engagement.

It also works both ways, now that I am able to focus on just giving them an MVP I make recommendations along those lines. I can recommend that they use a Bootstrap template and they don't see it as "cheap design", but rather a "an affordable, clean interface that helps validate their hypothesis". Frees me to work on the business logic of what they want and the quirks of their application. I also make hosting recommendations based on who I know they are (people trying to get projects off the ground, so they are cash-flow sensitive).

The difference between the clients I get now and the ones I used to get are night and day, because there is no ambiguity in what the client wants and what I will give them.

Best decision from a "freelancing" perspective I have ever made.