Deluxe4K

Is the shield, a totem or a firework annoying to always carry in the second hand, because a piece of the screen gets filled. Well this resource pack takes care of that by attaching these items to the arm and making them invisible in firstperson.

Furthermore it should be usable for every version. Are you playing Minecraft 1.8 and then you switch to 1.12 or 1.18? You can simply switch Minecraft without also switching the pack, because all versions are supported in the one pack. Active versions supported are 1.8 to 1.21. If you are using a newer or older version, this will also work. 

In 1.7 3D textures like 3D ladders or 3D sugar cane were not supported yet. These are then simply displayed in 2D.

For Minecraft 1.8.9 or lower optifine is required, otherwise some textures look shifted or warped.
For newer versions optifine is not needed. But it is still recommended, because connected blocks and stackable items are not available otherwise. But there are alternative mods, which add these features again.

The resource pack itself should give you a nice realistic feel to Minecraft without using much of the computer's power. Items like arrows stack, which often changes the texture of some items per number of items. Blocks like Glass look connected, which makes it more realistic again.
And the 64x64 and 128x128 pixels per block look (there are few other variants), removes the pixelstyle without consuming much performance.

Another advantage is the support for mods, which means that some vanilla textures are replaced by those of Resourcepack.
It should be said that depending on the mod only parts of the textures are supported. In the mod Pixelmon the most textures are supported. Other supported mods are:

Advancedsolarpanel, Appliedenergistics2, Baubles, Bettergrassandleaves, Chisel, Computercraft, Forestry, Ironchest, Natura, Not Enough Items, Not Enough Items integration, Just Enough Items, Appleskin, Notenoughupdates, Thermalfoundation, Tinker and as briefly stated above Pixelmon.