This makes perfect sense. One think made bigger means a whole lot of other things are made bigger. So YES these features are all related in a synergistic manner.Well, once a boat is designed for a stand up, walk around double (probably queen) berth, as well as more storage, provisions, and liquids - then add on a bit more speed - and you will pretty much get all the rest of your "don't need" list along for the ride.
I'd venture that a boat designed just for a stand up, walk around double berth will bring the rest with it by default.
It would be difficult to provide more speed on a boat designed for more storage without increasing sail area.
Out of curiosity, why don't you like a separate shower? That is by far one of the nicer features of our last two boats - no more cleaning up after showers, no wet TP or towels, no wet toilet seat.
Stand up walk around queen sized cabin in a mono means a center cockpit usually as well.
I discovered quite by accident that the showering arrangement on my boat is not only acceptable... but something which seems to offer some benefits for the way we use the boat and the accommodation plan it has. We have an 80x80 bunk aft which we can obviously sleep either fore and aft or athwart-ship... and so the V which is also a double is used as a walk in closet and berths for guests when they stay over.
The head is just aft of the V and far from where we sleep which is fine for noise and smells and so on. It also has a large hatch on CL for ventilation... or taking the spinnaker up and down for storage under the V. That hatch will dry out the head which is also the shower. We use a hand shower which is also the sink faucet. We can sit on the head to shower or stand up. It has the mirror and lockers with towels and so on. When we finish showering we squeegee to walls. Essentially the head gets a wash whenever we shower. Who washes their head? We do ever time we shower! Our head has no odors whatsoever. And for a boat shower.. one of our size... it's spacious but has hand holds too. Flow through ventilation is fabulous.
As far as speed is concerned. Adding a few feet to the LWL will only slightly increase hull speed. So unless it's a much longer LWL and different underbody.... the speed difference is slight. If you consider for example... all the boats who did the Marion Bermuda race when I did in '91. It was a 670 or so mile journey... and 200 boats of sizes from perhaps high 20s to maybe 50+ all arrived with a span of maybe 12 hrs (all guesses here) for a 4-5 day trip. In the big picture not all that much difference. But for competition seconds and minutes are a big deal. For cruising purposes.. no big deal really.
Bigger sails means much bigger forces on the running rigging.. and more effort in raising and so on. I am fine with the fractional I have with a smallish RF head sail and a large main which is raised once with a drill powered winch.