I'd also love to see LNs with more illustrations (best of both worlds?)
the 'advantage' of a manga - you get to see what is described, i.e. a costume/dress/(or lack thereof) or armor/battle scene/fighting pose
the 'advantage' of a LN - you get more plot- more nuanced character development, more detailed descriptions, more dialog
the 'advantage' of an anime - you get to see/hear characters 'brought to life' or awesome action scenes - or monsters or whatever
I know I've mentioned it somewhere else in the fora - but I'd love to see/buy LNs with many more illustrations, or even a hybrid volume (every 5th chapter or interludes as manga ?) -- this is why I LOVE/BUY the JNC versions of LNs from JNC - extra art, bonus stories, author or translator notes etc. why give Bezos more money when the JNC edition is better (for less$$) but I digress
I'd love to see more volumes like the Bookworm fan books - the problem - how does it get licensed? how do royalties get paid? ---publishing a LN w/ artwork imported from the manga or an omnibus/collectors edition of a LN is (by definition) a derivative work - and would require an extra/additional license to be compliant with copyrights etc. (and the license holders of the LN and the manga might not be the same entities)
because this wouldn't be easy - I believe the buying public would understand/pay the premium $$,