1% is how much effort I have to put in braking compared to mech discs.
LOL
The reality is I just want Sram Red 22 mechanical forever and (more importantly) have a horrible track record when it comes to bleeding hydro that also involves being shouted at by my wife.
These days I generally get shops to build 'new' bikes and then I don't touch the hydros again until it's time to replace the bike or swap groupsets or something equally dramatic. I don't even have any bleed kits now.
1% is how much effort I have to put in braking compared to mech discs.