A decent indication that it's not as simple as "well just call it x instead" is that each time I see a comment like this there is often a new "easy" word for monad. Yours is new to me, so I'll add it to the list:

Monads are hard, let's call them

- FlatMappable

- AndThenable

- Joinable

- Chainable (or, Daisychain)

- Computation Builder