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Reverb droppers are such a nightmare. I had a friend a few weeks ago lose pressure due to a bad installation and kinked -> split hose. There was no way of putting the saddle down so she had to ride a 7km downhill trail with her 170mm dropper at full height. At least electronic stuff normally has some kind of crash recovery mode, hydraulic is 100% ∨ 0%.
The levers do make excellent DOT pistols though, I managed to hit a colleague in the eye from 5m completely by accident a few years ago.
I've got a hydraulic Reverb currently, which works very well - but removing a hydraulic line that could leak would be beneficial. It's also a bit of a pain to route through the frame, but of course that doesn't happen very often so not really an issue.
I'm more thinking that having a spare battery on the post would be useful incase I forget to charge one for the mech, but then they're so small and I have spares from my travel bike (original Red AXS) so that's probably a non-issue also.