Unless you’re willing to bundle everything beyond pure Buddha-tier equanimity as “character flaws.”
it’s unfair to draw the line between “useless thing you were socialized to spend money on” and “useless thing someone else was socialized to spend money on.”
"Failure to see reason" is probably the next biggest red-flag/dealbreaker for me.
I'm going to die alone.
Then there's consumer electronics manufacturing... ...or being a tourist to the Saudi Arabia/Turkey/Russia/UAE where modern-day slavery is taking place at scale.
Out of sight, out of mind.
We’re all deluding ourselves for the sake of sanity + having nice stuff.
So a shiny thing that’s less expensive actually doesn’t satisfy the same role.
A shiny thing that’s just as expensive but less valuable (ie lower $/karat, ie lab grown) is so large as to out itself as not-the-truly-ridiculous waste of money that a real diamond is supposed to be for its signaling value.
You can't fix the whole world with personal choices, like an eyedropper against the ocean, but you can still opt out of the worst excesses without having to compromise every modern convenience.