I dont think Moon Wizard was telling you to F off in any way. And Im not about to either.
The Core Rulesets - 5E, Pathfinder (official and free), 3.5E, 4E - are all actively supported and (at least the first two) actively developed.
Numenera has just acquired a new developer (Darrenan).
Savage Worlds (Ikael), Call of Cthulhu 7E (IanMWard/damned), Starfinder (Samarex) and Castles & Crusades (Andraax/Talyn) are all actively supported and developed (ongoing development definitely varies between the sets). Barbarians of Lemuria (IanMWard/damned) is supported (we will fix any errors bugs) but not being enhanced.
13th Age, Traveller and NEW are all pretty new and the developer(s) are still finding their feet on the right level of support. I hope their support does improve too.
d20 Modern, BRP, Mutants & Masterminds are unsupported.
Rolemaster gets support but no dev work.
Call of Cthulhu 6E is supported (IanMWard/Moon Wizard) but no dev work.
Fate (Ian Kirby) is supported but no dev work.
There are several rulesets in Dev at the moment - Warhammer 4, Pathfinder 2 and two others that Im not sure have been announced.
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I would certainly hope that all rulesets are working and workable. I would hope that they support the bulk of common rules/play. They will never support (via coding and automation) all the possibilities. Some things are very, very hard to do in code and take a long time (Starship combat in Starfinder for example). Hopefully those things that are announced eventually get done. For the most part - it is pretty unlikely that any ruleset will reach and maintain 5E's level.
Ultimately the sticker price is not that relevant to the quality of the ruleset. I know that seems sucky but it is a reality. 5E outsells everything else combined at least 2:1. In terms of games played its 5E 2:1 everything else. Pathfinder and Savage Worlds together are played as much as everything else (bar 5E) combined. Of the 23 listed game systems being played (listed because statistically there were enough games played to list them) 9 were on community rulesets.
Many of these community rulesets have had many hundreds of hours of dev work go into them. The reasons why they are community varies. A not insignificant reason cited by some devs is that as a community ruleset they dont have the pressure of maintaining a commercial ruleset.
Dont get me wrong - Im not disagreeing with you. Id like to see these rulesets be better. Im just highlighting some of the other sides of (this multifaceted) coin.
Yes $40 is more expensive than the 5E PHB but it does have a lot of stuff in it. Ive spent double that on RPG books that Ive really not connected with. I think this ruleset should be more like $20 and at the same time I think Savage Worlds and Castles & Crusades should be $20-$30.
I do get protective of the community devs because I know they put in a tremendous amount of time in building these rulesets/modules/references. And for the most part what they actually get paid is very little because there is no real volume on these products.