All this said, i don't think I'd put a free swiveling tailwheel on our RV-6.
Neither will I
Any kind of serious crosscountry flying will, one day or another, require all controllability, including that tailwheel steering...
My tale, here goes:
Some 30 years ago, whilst stationed in Germany, got trusted to fly the Focke Wulf FW44 Stieglitz. Pre 2nd WW design with a nice BMW radial, spitting oil in your face thanks to the lack of rocker covers. Converted from skid to a free castoring tailwheel. Very nice and effective flight controls. Visibility... well, biplane like.
Had fun for some 10+ hours locally before venturing to some other strips.
Bad Durkheim, 600m of concrete... where thanks to some crosswind, turbulence and a lousy landing, I came this close to ruining this museum piece
In fact, I just managed to keep it on the concrete, waving from one edge to the other probably covering twice the runway length... once stopped my passenger jumps out in the breeze and shouts „hey, that was a super landing!“, whilst jelly legs and brown underwear kept me seated in the pit for a couple of minutes... I’ll sure never forget this one