I think it would be better to include them as resource packs, because having a separate page for resource packs which have shaders would give people an excuse to make multiple posts of the same pack if it was a resource pack which had both regular resource packy stuff as well as shaders.

No, I think it should be added as a tag, like how in the datapacks section you have checkmarks for if the datapack adds functions, recipes, structures, etc...



I agree, it should be renamed to resource packs, they were changed to that specifically for the reason that they no longer only support textures.



I really don't agree, however, that optifine is almost obsolete now that shaders are a part of resource packs.

Only a small margin of people actually use it for shaders specifically, the majority of players who use it are generally
a. people who have relatively low-spec computers and can't run the game without it

b. people who just want the handy zoom feature
c. people who do have decent computers, but use it for it's various visual upgrades, like it's connected texture support, better grass, stuff lie that

(I'm c, I have a computer perfectly capable of running shaders and still getting frame rates up in the hundreds, but I very rarely use optifine for shaders, I just love the visual upgrades optifine makes by itself)