Interesting questions.
I haven't had much feedback about minimalism as it doesn't really affect my friends/family that much. But people do seem to think it can impede dating - no car, no real bed, no sofa, no own place, etc. But I think it is fine for the right person. I don't want those other people anyhow. I actually make a point of bringing up my minimalism to any men who I see dating potential with. So far they've all also been people who practice minimalism in some capacity, or have in the past, or are at least interested in it. If I ever have the minimalist conversation with a man who is completely the opposite, I'll let you know how it goes.

For death and relatives, I think my family generally agrees that the best gift you can give your children is to get rid of most of your stuff before you go. My will specifically indicates to either donate or sell all my stuff. Anyone I'm giving anything to needs the cash more than boring household stuff. None of my mementos will mean anything to anyone else.

I think the bigger relationship stumbling block is the frugality. People see you as cheap and uncaring if you don't give gifts. They also think it's hard to date frugally. I disagree. But I do have an amount of money I plan to spend each month on social activities. I'd rather do cheap ones but paying is necessary for some things.

I think spending time with people is more important than money. Generally people who disagree just aren't in my life that much.