A cycling desk / Zwifting with a split keyboard

fucking Inigo San Milan and Peter Attia and their "zone 2" bullshit

this is nothing new. Back in the day, the teaching was "ride in the little ring in winter" which was essentially Zone 2

Plus San Milan is tainted by his Saunier Duval years, and Attia is clearly a grifter

Just fucking ride. Most of the time easy, once or twice a week hard

now get off my lawn!

"most of the time easy" ... = z2. z1 isn't going to lead to any adaptations (or burn many calories, depending on your objective), and z3+ isn't "easy", so for all your agita about San Milan & Attia you're basically saying the same thing.

Or to tie this into running, too, the same thing Maffetone & Friel also espouse.