Some textures still have not been updated to match the current style of textures. The main problem is that they have far too many colors that are too similar to each other to justify their inclusions, which in-turn makes some of them look plastic-y or too noisy. I've included a list of some the outdated textures that I have noticed below:

• Blaze Powder
• All Shulkers and Shulker Boxes
• All Stripped Wood
• All Wools
• Handles of both Torches
• Lever
• Tripwire Hook
• Chests and Trapped Chests
• Widgets
• Seeds