And I guess I am not the first person to wonder about this, any people wanting to share a bookmark/url, tia (so I don't have to use google... ;) )
So if you're hosting via some accelerator like Cloudflare, AWS API Gateway, whatever Google has in this space, or app host like Heroku and friends, they'll happily do the work because they get the aggregate benefit. Your own site will become marginally faster or have happier roaming users, and so on, essentially for free.
When you're developing a generic website, I don't think you should care about this. When you're self-hosting, you can decide if it might be worth it or not. It probably won't be worth the effort unless you're doing something really intricate or special, in which case you'll be really happy that you have the option.
But, if I had to pay the electric bill on 2.5 million servers, I would definitely care about wasting resources sending extra packets.
It's a micro optimisation that won't even register for your users, especially if you're reducing latency on 2mb of JS bundles
Until there is dedicated hardware NICs I think you would find HTTP/3 has worse latency. That is until dedicated NIC accelerators come out on the market.