Swap the batteries, tips, charging case, shell, or even just individual buds.
But of course we all know that the big manufacturers don't do this not because they can't but because they don't want to. Planned obsolescence is still very much the name of the game, despite all the bullshit they spout about sustainability.
It's hard for a small manufacturer to start selling in overseas markets. It would take a certain volume for them to have the capital to set up shop in the US.
You should ask your carrier why. Why they don't offer it. EU and US are two different market where people don't buy phones in the same way.
They cut the cost by not selling it to the carriers which will sell it to the customer.
In my European country, the market is dynamic. The fairphone 5 is available in multiple store. People have cheap mobile plan without contract. Another type of market.