As already mentioned, dropper posts are one of the most evolutionary introductions in Mountain biking in a long time.
I believe that if used properly, they can increase skills and confidence (especially in novice riders) exponentially.
Personally I'd never have a bike without one (roadie excluded).
If you're used to riding a fixed post, it does take some perseverance and muscle memory training for a Dropper to become second nature.
It's documented in every article and review that droppers are conclusively a positive inclusion to any bike build, even by people who previously were skeptical.
It's up to the OP whether he want to fuck it off for a fixed post, but unless your an XC whippet counting every last gram, the benefits will eventually outweigh any negatives.
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