Heh. I currently have no less than seven different ship combat systems sitting on my hard drive right now. Might saunter down for an eighth.
Sold better? Spelljammer is like the best selling 5e product after the core right now. How much better do you think it could sell?
And no one is providing the middle? Again, I point you to DM's Guild. There are half a dozen good ship combat systems there from purely narrative to nice and crunchy. WotC provided the system that players wanted (note, players, not DM's) because it's quick, fun and lets them get to play their characters rather than turn their session into a tabletop wargame.
This gets back to my point about the biggest problem in 5e - the complete lack of interest by fans in anything that doesn't have the WotC seal of approval. For example:
Do you have any idea how many arms and equipment guides there are on DM's Guild for 5e? Lessee, I added 5e, equipment, and searched for mundane. Out of the list of hundreds of entries, I spy this one:
Xanathar's Extraordinary Vault - More magic... More gear... More treasure... More Xanathar! Xanathar has spent centuries accumulating loot beneath the st
www.dmsguild.com
500 items, professional quality, nice art. Ten bucks.
Why on earth do you need WotC to do this?