The thing is, I do agree with him (and wide-eyed, courting you) about the value of simple pleasures. Like everyone, we've made a great deal of our garden, walks and bike rides during lockdown.
They are not the only pleasures though. I suppose I evaluate value and benefits, then consider whether we can afford the thing or not. Some things, like swimming or musical instrument lessons, require considerable investment, of money and time. So worthwhile though and there are no shortcuts to those things.
To me though, perhaps the biggest value of having some money available, is to provide a buffer, a safety-net, a cushion, a rescue fund; so that when things go a bit wrong, you can buy yourself out quickly and easily, without stress. Money provides peace of mind. If it would make all the difference and avoid considerable stress, upset or discomfort to get a taxi, stay in a hotel, buy the silly expensive food, buy a new one of whatever it is, then you can do that. Knowing that buys peace and security and makes life so much smoother.
I would not give that up easily, for me or for my DC. I'm generally 'careful' (take sandwiches etc) and plan well but there are occasionally situations when, given we can pay, I would feel cruel to deny something / impose the more difficult approach.