Interesting.
I use my FT5 all the time, and though it took me a while to get it where I wanted it to be.
It is stable at this point.
I have no current plans to change anything on it.
It just works!
My interest in the Voron would mainly be if I didn't have an FT-5 already (in its current trim state).
But frankly, I really like @csorrows design concept for a follow-on FT-5 "R3", or whatever it would be called.
It ticks nearly all the boxes for me, and were I to scratch-build another printer I would very likely base it on that.
The additions I would then make would be a mains heated bed, auto power-off, geared dual side extruder, and elimination of the front cross bar, for starters.
But as a core product, I think the R3 would be a solid winner.
Let's hope FT comes back to life soon so the R3 might be released to the marketplace.
Full CoreXY, while very, very nice to have, is not "necessary" IMHO.
Because of the linear rails my H-Bot setup has proven to be very reliable, quiet and accurate.
I also totally agree with Chris's statement that the FT-5 is made to be modified.
And that was one of the major selling points that led me to purchase mine in the first place.
Others, such as the Ender4 that I purchased for our son are just fine, but are also "canned designs".
It is what it is, but it is also just about all that it can be (without incurring major headaches).
The FT6 is a marvel IMHO.
If I needed a larger format printer, I would be looking to get one for sure.
But to be honest about 95% of all the things I print are less than 150mm on any axis.
FWIW...