Welcome. I'll share some of my thoughts and you can combine that with those that others share.
Sinks, within smaller campers, are always a compromise. Yes we sometimes wish for a larger and deeper sink while washing some pots/pans, but we try to size most pans and dishes for the camper rather than using full size, so that helps. No issues with sink size while washing the rest of the dishes, washing hands, brushing teeth, etc. And, this sink is better (size and location) than our previous camper's sink, so no complaints from us! Ha. A larger and deeper sink would intrude on the cabinet space below and then the domino effect a wider sink would have on the stovetop and the drawer next to that.
Deleting it isn't a bad idea if you will never use it. You could delete the faucet as well and simply pull out the shower hose for when you want hot/cold water. The shower hose/faucet is included even if you don't get the optional interior shower since the idea is you'll still be able to use that for an outside shower or cleaning off boots, feet, pets, etc.
That hose is long enough so you could fill a dishpan and do dishes anywhere on the countertop, on the floor while standing outside the camper, or outside with a dishpan on a table.
In the galley cabinet, you would gain a void where the sink would normally be, but there would be no shelving there unless you had it customized (pics at the end of this post). And, the shower hose/controller sticks out into that space anyway so you won't be able to freely slide a full-width basket in/out on that top shelf even if the shelf was expanded rearward. The void could potentially allow taller items to be stored from the next shelf down, but you'd have to be mindful if it pushing/rubbing on any remaining plumping/lines.
The other option, and what I would lean towards, is keep the sink and faucet. They would be nice to have on occasion. Then simply cover the sink with a section of countersunk countertop or cutting board so you have use of that countertop space. And, you could use the sink itself for storage as you have done in the past, but have the option of pulling it out and using the sink. That is similar to the shower stall serving dual modes of being both a shower pan and a bench with storage for the toilet and other items when not being used as a shower.
Wouldn't be too hard to custom make one yourself, have a woodworking friend make one, or buy one of the retail options available, such as"
Mauricio and Julia offer a custom sink cutting board cover (and also their STC Flagship-specific bug screen). See images here (scroll down for board).
https://static1.squarespace.com/sta...720185261694/Lyles+Bugout+Products+V3+web.pdf
We don't typically listen to music when we camp (or drive for that matter) so not a lot of help there, but the latest gen of portable bluetooth speakers seems like a perfect solution because then you can move it wherever you want and can use it in the offseason when not using the camper. I paid for an optional head unit and two speakers in my fishing boat and it was way over priced and sound quality is mediocre to poor. I could have bought one or two portable bluetooth speakers for a fraction of the cost, had better sound, and used them other places rather than a system dedicated to the fishing boat. Live and learn. Ha.
Including pictures looking inward through the top shelf so you can see the void the sink would leave if deleted.
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