There is a schism. It's not new. The first time I noticed it was with Dungeon World, though there may be precursors I'm not immediately aware of.
The OSR has separated into two very distinct groups. The first is those that are actually based on the old games including all of TSR D&D and any other game designed before the year 2000 - the true OSR. The second is, generally, not that. There are a few paths these faux-SR games take.
5E Basic: 5E is such a trash game that pretty much since it came out people have been pairing down the trash within it or simply using some elements of the DMG nobody read. The most recent and real reason behind this post is ShadowDark, which has such a redundant name the the silly nicknames practically write themselves. This game is the straw that broke the camel's back and caused me to explain this unholy separation. If a game uses Advantage/Disadvantage, short rest mechanics, or has a usage die to bizarrely abstract something necessary and concrete that is completely anti-thetical to the game style you're aping, you count as a 5E Basic. Index Card RPG, Black Hack, 5 Torches Deep, ShadowDark, etc are not OSR regardless of the creator's intentions. They step outside bounds.
Forgey shit: The living members of the Forge, Vinny Baker and Luke Crane (Ron Edwards might not be dead but I hope he is) made or contributed to a couple D&D-themed games completely irrelevant to the OSR. Basically any game that touches the ideals of the Forge are trash at offset. The Nightmares Underneath survives it's OSR status in spite of specially thanking or accounting these two as inspirado because the game itself doesn't actually show any design on that front. Dungeon World isn't OSR, nor is anything Forged in the Dark. It's all Forgey shit.
Hyper-Minimalism: With a heavy heart, I must also discard minimalism in it's total. Light games are fine, but when they get to a certain level of lightness, they cease being games possible to play for campaigns and relegate themselves to con games or one shots. Probably the lightest possible real OSR is Microlite20. Even Searchers of the Unknown is simply too light to be OSR anymore and instead falls into the trap of being a game session system rather than a game campaign system. That is distinctly Hyper-Minimalist and not at all OSR.
All of these games are now excommunicado from the OSR and their lives are forfeit. I have suffered their existence far too long.
