occasionally one reads articles about treeless saddles being bad for a horses back ..
i thought i'd say that Molly's back has improved a lot over the last while since i've been using a treeless saddle (mostly a fhoenix or vogue, after a short spell with a barefoot)
I did that as would never have got a treed to fit molly anyway and having read up on them decided to go that route.
I think if you buy one that isn't from a reputable manufacturer/name, isn't properly constructed (i've seen pics of some horrors with e.g. cardboard where the memory foam shoudl be!) and don't put a proper pad underneath whatever you use, then yes, you'll have problems. in the same way that if you use a treed saddle that's too narrow/wide/unstuffed/other fault you'll have problems.
but i think a properly made treeless saddle, properly fitted to the right horse with the right pad/numnah, will not be bad for the horses back and in fact will be positively good.
there are some good before/after photos about of horses whose muscles have come back to their proper form/place/state after use of a treeless
and we've all seen awful atrophy at the wither of horses ridden in ill fitting saddles...
guess I'm a convinced convert?
i don't believe they do work for all horses, and i don't believe they suit all riders...
but they're not bad for the back!
and molly? muscling up much better than she ever has, after some good work in a treeless saddle! i'll never get rid of the congenital asymmetry, but no more hollows and is looking good!