Maybe showing my age, but this reminds me of the time when Apple began upgrading from OS 9 to OS X. There were a few years where there were "Universal" apps that worked on both types of systems, but eventually people stopped developing for OS 9 because it was clear OS X was the future.
I recently rejoined SL after being away for years and I'm sort of struck that the graphics are still more or less the same as they were back then. As someone else pointed out, we mostly come here for features other than graphics, but I think if SL wants to grow, or keep up, it will need to improve the graphics performance... or maybe I need a better graphics card in my PC ;-) Still, I looked at the Creation Portal on the Second Life Wiki and noticed the last time someone edited it was in 2012. Are all of the links that old? Are there any newer articles that could be added, or could older ones be updated? The wiki's theme isn't even responsive or mobile friendly.
I hope the powers-that-be will take a look at the ecosystem surrounding SL and realize it's no longer the new bright and shiny viral sensation it was 10 - 15 years ago. If I were a doctor and Second Life was my patient, I would tell it to get a little more exercise and watch its cholesterol.
FWIW I noticed the latest edition of "Second Life: The Official Guide" is copyright 2008. I haven't gone through it, but I wonder how much of its information still holds up.