When considering the benefits of a dropper post on a gravel bike, what are the key factors to weigh when deciding whether the added weight and potential reliability concerns outweigh the advantages of improved handling and confidence on technical descents and steep, loose terrain? Specifically, how do the varying designs and implementations of dropper post technologies impact the overall durability and maintenance requirements of this component in the context of frequent gravel riding, and are there any emerging trends or innovations that seek to address these concerns and further blur the lines between gravel and mountain bike design?