"Lie of minimalism" - I've never encountered that belief before - you've obviously never tried it. Minimalism doesn't mean "going without" it means finding out what you need to be happy, and having only that stuff.
A motorboat is a silly example that most people don't want anyway. Minimalism is, like consumerism, still obsessed with things. Hop onto r/minimalism and you'll quickly find many people who stress over not having fewer material possessions, and who force themselves to forgo essentials like clothing and hygiene products. It's not the final answer.
the one without the motorboat that will be probably poorer than the first and cannot take his family on a motorboat trip every weekend. Also renting a motorboat is a stressor too in case you can afford it.