I'm all for blood and gore back, it was another thing that was removed without reason imo. I don't think we were ever told why it was removed. Halo 5 was too clean looking, the shiney Spartans looked odd too, a bit grit and a bucket of blood would work wonders for me.
One word: minors.
Minors are part of Halo's consumer base, unless I'm mistaken and the Halo mega blox game was intended for an adult like me.
There are also also many Halo 5 competitors who actually had to switch from other games because they legally were not allowed to compete in M Rated game tournament, so Halo 5 being rated T was most likely a financial decision, imo.
They could have easily added gore and blood and even more adult language and content, but they chose not too because that narrows the audience (theoretically)
their excuse would be something along the lines if "oh, in the lore, Spartans have super suits made of self repairing poly rubber so blood would not exit the suit at all" but we all know the real reason: $$$
for Halo 6 I definitely think they need to bring back blood and create more adult related content, I mean, there are A LOT of adults who play Halo. If they want to appeal to the minor fan base, why not just reintroduce the mega block game? Also, GOW is proof that if players don't like gore or adult language, they can just switch it off in the settings.
But hey, common sense doesn't seem to be too common anymore.