On: The Cost of Abstraction (2016)

[Tarean]

On the other hand, the lens library in haskell is extremely abstract. Libraries obviously have different tradeoffs but using lens can increase the onboarding cost significantly for new team members.

I am mentioning lens because it has a both function:

    incBoth = both += 1

Which has a fun type signature:

    incBoth :: (Bitraversal p, MonadState (p a a) m,  Num a) => m ()

[tome → Tarean]

Hmm, don't you use it as a monadic action like

    do
        ...
        both += 1