ELI5: How are the current dungeons hard?

[Jinglypockets]

I keep coming back to the "More nonstandard telegraphs" thing because it seems like a myth. Nonstandard telegraphs have been in widespread use for a really long time.

Here are bosses with nonstandard telegraphs I can think of off the top of my head just in base Endwalker:
Tower of Zot:
First boss: Watch cast names and locations of projectiles to find the safe spots on Transmute Fire and Transmute Bio
Second Boss: Manusya Confuse and the orbs around the outside of the room.

Tower of Babil
First boss: Negative/positive polarities, frontal line aoe where you have to watch boss facing instead of ground telegraph
Second boss: Frog/shrink mechanics, bombs with cross AOEs
Third boss: Lunar Nail, suck with continuous AOE in the center of the room

Vanaspati
First boss: Spinning you around, arms raised for half-room aoe, listening to mouths to find safe spot
Second boss: bubbles for safety from raidwide
Third boss: Symbols for safe squares, meteors for safe lines

Ktisis Hyperboreia
First boss: Footprints to find safe spot
Second boss: Heads to find safe spot for breath, orbs with cross AOEs
Third boss: Quadruple, Find safe meteorite without cracks, find safe side by watching the outside of the room

Aitiascope:
First boss: Watch arms for safe quadrants, watch spokes to avoid rebound
Second boss: Rock timing for safe spot from line AOE, AOE expands to clusters
Third boss: Thundaga wedges, Curtain Call, Firaga half-room AOEs

Dead Ends:
First boss: Wind moves the Miasma AOEs
Second boss: Order to Fire spokes
Third boss: Prance, watch wings for half-room AOE, watch butterflies for safe lines

Smileton
First boss: Red/blue faces
Second boss: Watch facing of adds to avoid AOEs
Third boss: Bomb conveyor belt arrows to find safe spot

Stigma Dreamscape
First boss: Guided missiles
Second boss: Numbers for line AOEs
Third boss: In/out AOE, forced movement

The only dungeon boss I can think of in 6.0 that doesn't have anything like this is the last boss in Zot, which I'm assuming is *very* challenging for the folks who are struggling with things like Alexandria.