I enjoy several GW skirmish games these days, Underworlds, Kill Team and Blood Bowl. They all got great qualities that Necromunda could learn from.
Only one of those games is done by the specialist games team though (being bloodbowl). The other two (Underworlds and Kill Team) are written and managed by the actual rules writers for the main games.
That is why Underworlds and Kill team are actually very tightly written rules, while Necromunda and (to a lesser extent) bloodbowl are heaping piles of crud.
The main reasons Bloodbowl isn’t dying under the weight of multiple rulebooks are because it was reset from the 2016 rules to other a 2020 ruleset, and because there ability to f**k with only 4 main stats is limited (even though they found a way and made a new passing stat!).
Bloodbowl also has the benefit that it was already very “wide” in terms of available teams, with 24 already established races in 2016 which they have expanded to 28 since 2016, as well as rewriting 3 of them, and adding new positionals and roster changes to 9 of them.
we are also still to see new models released for 4 existing teams, so there is still scope for GW to sell new stuff without creating any new rules and we are 7 years into the revamp.
Compare that with Necromunda where there are only 6 standard house gangs and they were all released with new models in the first year and a half on N17, essentially leaving GW with no more runway for easy revamps of exisiting miniatures.
They could have done things differently (and I think they should have) by following up the 6 house gangs with smaller box sets of Juves and champions/leaders as well as the weapon packs. That would have given them 2-3 years of runway on the base set of models.
They could then have followed that up with the already existing Outlander gangs in a “second season” which had 5 more gangs ready to go and could again have stretched over 2-3 years of releases with some modifications of those gang lists to include a base box and smaller champion/juve boxes/clam shells.
Again all of that without adding anything “new” to the setting, and we haven’t even hit enforcers or ash wastes nomads at that stage, plus squats, corpse grinders, gene stealer cults, chaos cults, Venators, hive scum gangs, or anything else they could have dreamed up.
And all of this without hitting the ash wastes as a setting.
Honestly I think Necromunda really just suffered as a result of its popularity and success which made GW want to keep releasing things for it that have made the setting unsustainable.