Can a Way of Shadow monk use Shadow Step to teleport to the Ethereal Plane if they can see into it?

Question

I am currently playing a Way of Shadow monk, and my character now has a robe of eyes. (I am loving the Waterdeep: Dungeon of the Mad Mage campaign.)

The description of the robe of eyes says, in part (emphasis mine):

You can see invisible creatures and objects, as well as see into the Ethereal Plane, out to a range of 120 feet.

The description of the Way of Shadow monk's Shadow Step feature says, in part (PHB, p. 80; emphasis mine):

When you are in dim light or darkness, as a bonus action you can teleport up to 60 feet to an unoccupied space you can see that is also in dim light or darkness.

Does this mean that I can use Shadow Step to enter the Ethereal Plane, scout around, and then Shadow Step back in on the following round?

Answer 1

No, Shadow Step can't teleport you to the Ethereal Plane.

The Ethereal Plane is not just 60 feet away.

"Planar Travel" describes the boundaries between planes as being distinctly more than an orthogonal distance:

When adventurers travel into other planes of existence, they are undertaking a legendary journey across the thresholds of existence to a mythic destination where they strive to complete their quest.

Power is required

The proposed interpretation of Shadow Step is clever, but out of line with the power required to traverse planar boundaries. Etherealness, plane shift, astral projection, and gate are spells that permit planar travel. They range from 7th- to 9th-level spells.

For comparison, a caster would need to be 13th-level to have a single 7th-level spell slot. Shadow Step is a bonus-action subclass feature that Way of Shadow monks get at 6th level.