For me, I'm not entirely opposed to having solo-players / casuals get into raids to see the story, especially when the landscape and raid stories intertwine, which, despite comments in this thread, they should absolutely do so, the whole point of the landscape story is to build up for the instance content, that's what it more or less ALWAYS has been, quite frankly, in any MMO, they don't just drop bosses out of nowhere for no reason, there is a point to them.

However, that being said, it's almost as if you need to make a tier "below" tier 1, which has basically no mechanics, and virtually no loot (and yes, I am that person who maintains if you want raid-tier loot you need to work for it just like everyone else does); because as was pointed out by Arnenna, most people couldn't even get past boss 3 in Remmorchant to see the Shelob fight in the first place.