I'm not sure, i didn't really have any setbacks with s/h and its a great way of growing plants.
It's a number of factors why i don't like to use s/h
I think Leca looks hideous, i use lava rock for a few and i also grow in lava rock non s/h
I like to grow alot of my plants in baskets or nets like epi porpax, bulbos etc that grow over the edge of the pot so i usually choose for sphag or epi
I favour epi over
sh so i grow alot of my stuff on epi branches or epiweb cubes in pots with some sphag, i got really healthy roots since i used epiweb.
I'm not really sure why i don't use S/H much i just prefer other ways of growing more, the way i see it you can grow orchids in any kind of medium aslong as you are able to provide good light, air and moisture it doesnt really matter where you grow.
I've grown some in the most weird things, like potted in cut-up scrub pads, water culture, rocks etc
It probably wont take very long to grow your Max. to fairly large size, from what i know from Tenuifolia is that they are fast growers if you can provide them what they need.
Some say they sulk for a while if theyre disturbed however mine has taken beatings and abusings and its still producing new growths and roots so i'm not sure if thats true.
Looks like the OP is growing his/her tenuifolia in Sphag aswell, could be wrong.