Getting back to that OPC question and talking about boats with more than 40ft (smaller boats can have a purchase system for the main sheet if the system runs on the cockpit and only need two).
As I have pointed out there are two cases, main mass market cruisers and performance cruisers.
Regarding main market cruisers the tendency is to have a single winch near each wheel and have also there the blocks, so you block one line and use the winch on the other sheet. Whit this system, due to the rigging and position of blocks it is almost impossible to add another winch. Regarding these boats only Bavaria offers the possibility of another pair of winches, but those are not near the wheel. There are two exception that I know off and I will talk about them later.
Regarding performance cruisers only very recently that was taken into consideration (with some very few exceptions) and the normal set up was to have 4 winches on the cockpit but well separated and none near the wheel. The reason has to do with giving more space for maneuver when the boat is used for crewed racing. The First 40, the Salona 410, The Comet 41s, the Xp 38, the Dehler 41 don't have any winch at easy reach from the wheels man.
Then on the some very recent performance cruisers they started taking more into consideration the needs of a solo sailor regarding the balance between what is optimal in solo sailing and racing and started to have one winch more near the wheel (on each side) and the other far way.
That's the case for instance of the new Elan 400:
Or the RM 1260
Let me point out that if on the RM you use a two tillers system (I think they have it on option) the problem is sorted out because with the extension you can reach the other winch. That's how it works on the Pogo 12.50:
The first performance cruiser to take that balance much more for solo sailing than for crewed racing was Dufour that on their performance line developed a system that is now used by other brands. Both the two winches from each side are easily accessible to a solo sailor:
Some other recent performance boats adopted the system, that's the case with the Azuree 46:
And I bet the next one, the new Azuree 40 will have that system too.
You can also make it easy for the solo sailor with only 3 winches near the wheel providing one is central and direct or German sheeting is used. That's what the Maxi 1200 does (even if I don't understand a performance boat without traveler). The system can also work with traveler but has to be rigged in another way.
Regarding the main market cruisers that use 3 or 4 winches easily accessible to the solo sailor, one is a very expensive boat, this Year's European luxury boat, the Contest 42CS. They propose multiple options regarding rigging including adapted to solo sailors:
and the other one is not a particularly expensive one for its size and it is the Dufour, the new 500 from the main line (Grand Large):
The problem was solved in an elegant way and a functional one. I looked to see if the 410 had space for the same...but it has not
. With the winch there there is no space to sit at the wheel.
On the even newer Dufour 560 they have also the same system as on the 500 but even with more space and probably working even better: