Barefoot humility?

Unfinished thoughts and questions on sandals:

1. Sandals and clothing go together--that's pretty intuitive, and also backed up biblically. Furthermore, sandals/clothes are a blessing (2 Chron 28.15, Song of Sol 7.1, Deut 29.5). Presumably, Adam would've worn sandals and robes eventually if he had never sinned.

2. In other words, it seems there's more to shoes than just protecting our feet from cursed ground.

3. Barefeet in the OT usually carry connotations of nakedness or shame (2 Sam 15.30, Isaiah 20.2-4, Micah 1.8).

4. So then, why does God require Moses to take off his sandals as he approaches the holy ground in Ex 3? Is God requiring "symbolic nakedness" of Moses? Why? Are barefeet more humble than shoes, perhaps?

5. How does this affect our understanding of holiness in general in the OT?

6. How might all this change in the NT?