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'Compressionless' isn't something Mr Young would agree with but I take the marketing point.
It's not the marketing point, it's the big difference in braking performance and confident.
A low compression housing mean there will be more flex in the housing before engaging the brakes, compressionless mean it will have minimal flex so you'll able to perform emergency stop without the levers hitting the bar and provide greater range of modulation and adjustablity.
Seriously, if you don't put compressionless housing, your bike isn't any difference to a disc brakes bicycle from 2008 that felt spongy and weak.
Biggest problem; brakes.
If the brakes mediocre, then it's not gonna be a good seller, gotta invest in a good combinaton of cable housing and brakes calipers, think Jagwire compressionless and Shimano flat mount calipers.
Or try and get a job lots of Juintech mechanical/hydraulic to keep cost down, they're cheaper as a set than a stand alone TRP HY/RD.