You definitely have a point there. But there are practical difficulties. 6-7 years ago, purchasing a crypto debit card was relatively easy. There used to be a lot of options out there. But new regulations from the Financial Action Task Force (FATF) changed everything. There are still 3-4 options available, but you need to go through all sort of KYC verifications to become eligible to purchase one. The fees has also increased by quite a bit.