I have a couple of ideas that are bubbling around my head to (hopefully) help everyone enjoy the content in the game, and am hoping for a bit of critique, as I'm far from capable of representing every audience in this game. For some clarity this does come from the perspective of an end-ish game player, I'm far from the most experienced raider, though I've certainly cleared quite a few on vet (maybe half and looking to complete more) as well as a hard mode or two, but I definitely want to see this game be a place for everyone.
An idea that would not require changes to the combat system itself could be a scroll/NPC for Normal dungeon/trial/arena variants that adds the raid dummy buffs and debuffs (or subsets thereof) to the enemies and grants major protection and major aegis to the players. Alternately, this scroll/NPC could offer something similar to Battle Spirit called something like Undaunted Spirit that increases all outgoing damage by x% and reduces all incoming damage by y%. Though, two potential side effects here would be that this could alter the way sets are farmed and daylies are completed, as I suspect many would elect to use this mode to do so. There is also a chance that this does not address the actual concern, as I'm not completely certain which content is content is considered too difficult, and so, hearing some conversation on this would certainly be interesting.
Another area where it may be possible to help those interested in learning or improving their weaving would be in light attack weaving with the Bow. Perhaps this is just me, but I've always found bow a bit trickier to weave with than the rest of the weapons as the projectile is small, travels in an arc, and the character/weapon move less comparted to other weapons during the animation. Chaning the animation on light and heavy attacks a bit may help here, perhaps if the animation were similar to that of Poison Injection (basically linear travel with a bit more of a visual effect for tracking purposes), it may be easier to weave with, assuming this is not just a 'me problem'. In theory, a change like this would only help players looking to improve their damage with this mechanic more consistently, those at the top end are already weaving more or less perfectly, so this should not impact the ceiling. I think other, relatively small, changes like this could help those looking to improve their damage as well, I suspect there are many of these smaller fixes that could be used to help remove barriers to entry for those wanting to improve their damage.
These solutions are not perfect, I'm not sure there is a perfect solution to such a problem, but thought the ideas were worth talking about and hearing criticism on.