I don't find it that farfetched. It's apparent that CVII didn't have anywhere near the polish that CVIII had. I happen to like Simon's Quest a lot, but it does feel sloppier than the other 2 NES games for sure. I wouldn't be surprised if it were ever revealed that the game was rushed quite a bit. Like Whip Her Snapper said, there could've been ideas or improvements that ended up on the cutting room floor due to time constraints.
Good call. There are graphics in the ROM image that are there more than once and not needed, while others like the unused zombie graphics are in there only one time. There are nine music tracks on this game, 3 bosses and very little in the way of diverse backgrounds. Though CV1 has less enemies there is better placement and movement routine. Plus it has 16 tracks and 6 bosses. CVIII 34 enemies 15 bosses 27 tracks. CVII is not a bad game. It has a lot of very innovative elements it just wasn't given the care it should have been given. I am not going to gripe about the day night transition being slow that added to the atmosphere (Ninja Gaiden one had a similar fade out load graphics operation, no complaints). The day night thing could have been more realistic with changing the pallette slowly over each hour passing.
If it could be done again.
CVIII graphics and platforming, CVI character movement routines and enemy placement, CVII puzzles, adventure and story.
You could mix the tracks as not a one of the tracks from these games are anything short of epic.