What does the OSR mean to you? I'm not asking you to define the OSR, because such a definition is fairly nebulous and arbitrary.
For me, the OSR means making the old new again. Keeping the rules I first found as a teen fresh and relevant 30+ years later.
The OSR means I can find new adventures for my old rules, and new rewrites of the old rules that are easier for these aging eyes to read and this aging mind to follow.
The OSR has given D&D of old the lifespan and vitality of a Tolkien Elf - it will not die even as those that deigned it have moved on to the beyond.
The OSR is. That in and of itself is an amazing thing.