It's not that bad, when used correctly they stay put a long time.

When I design furniture that needs one, I usually design it so the t-nut goes in from the other side so the screw secures it in, but honestly unless the wood gets wet, the t-nut will hold fine.

There are similar t-nuts with tiny screws instead of hammer in options. You can chisel out the wood and epoxy in a hex nut. You can just screw the leveling foot directly into the wood. You can put a larger metal plate in place.

But if the wood fails and the t-nut falls out, you can also just repair the wood or epoxy it back in and it'll hold for another few decades.

Most wood furniture won't last forever without repairs anyway, the fixes over the years are part of the charm.