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My 2 cents:
Cable: Set it up and forget it. Few years down the line, replace a cable.
Hydro: Everything is more complicated. Hoses are too short? Isnt as easy as just replacing housing...
One of the levers or calipers may develop an issue right out of the box, or shortly down the line.... either way, you dont know until it happens. And a lot of issues arent so simple to track down.
I try to avoid hydraulics whenever possible, but for actual mountain bike trail riding, i think you need it. Commuting/road riding; its just a "nice to have". I have never done gravel, so i cant speak to it, but i assume hydro would be good.
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