I see BBs as the devs at the time getting so enthused with the new thing they just don't prepare for those coming late to it and faced with a big roadblock, when the rest of us were learning and progressing with those more at the cutting edge of play when new.
My "workaround" was to have an alt account hunter sufficiently advanced to pay forward to any new main account char I brought to BBs. Initially we could "pug" and learn various tricks of the trade to make them easier. But late comers just don't have the numbers doing that content to tap into. Having a dumbed down version wasn't going to help get peeps into them if every wall they face "going at their own pace" is a time for just giving up, though this one is more understandable - you need progression to progress.
Perhaps, as soon as the cap rose, players could have been given sufficient points to get to rank 5+ in engineering and a possibility to advance. Like getting an some basic Light amount in Mordor if the gear isn't providing enough for later comers. Same deal with placing a raid drop as the main ingredient of a crafting tier and killing off that tiers for the later comers. Needs thought on the long term consequences, not something we see so much evidence of, carried along in the moment and out of mind - even when reminded.
Just take out those trait points from BBs and problem solved - not really. Just means you bin that content beyond maintenance mode even. Other merry-go-arounds for SSG to have us riding - the next "new" thing. I suppose it's the same with Mounted combat, when new and without much else to do you get to grips with it or give up on it if that's your way with anything that doesn't meet expectations or is left to stagnate. Too often it must be just written off by the devs but they just fail to tell us! So long as there's something to sell us in the store: promo point and mount traits, colours and cosmetics.