From the FAQ:
How many different effects does it include?
Every* effect from our Helix, HX, and M-Class product lines, including all the crazy cool stuff like Poly Pitch, Poly Sustain, Retro Reel, ADT, Dynamic reverbs, Shimmer, Tesselator, Shuffling Looper, etc. Over 260 total. HX One ships with firmware 3.60, and when 3.70 drops, you may see even more effects.
Later...
*Ha! You said it had every effect from Helix, but it clearly doesn’t have the 6 Switch Looper or the Volume/Pan stuff!
With a MIDI controller, the 1 Switch and Shuffling loopers can be controlled from 6 switches (or keys on your MIDI keyboard).
There's no expectation for future Helix/HX effects to be so DSP-intensive that they won't fit into all members of the family. There are exceedingly few single pedals with algorithms that eat up more cycles than Poly Pitch does in HX One.
Maybe a couple algorithms in H90 or the newest Meris stuff?
You conveniently ignored the important part, emphasis mine:
Whammy V is $299, same price as HX One. Drop is $239. EHX Freeze is $150. HX One does all of these (by many accounts, better than the standalones), plus another 250 effects, including a bunch of unique offerings you can't get anywhere else (unless you buy HX Effects or better). 3.70 will add a better, more controllable version of a $239 pedal plus a bunch of other stuff. 3.80 will add even more.
By "by many accounts," I'm not projecting my feelings on the matter. It's what many artists, producers, influencers, and customers have straight up told us.
<cringe>