They're telling you to take the wrong train to a transfer point instead of waiting for your train. So let's take a very common route, you're heading to Rosslyn from Springfield. Your blue line just got replaced by a fancy new Rush+ yellow line train. Your choice is to wait 6-10 minutes for an extra train, or just take yellow and transfer at L'Enfant Plaza. Metro is suggesting you just get on and transfer, even though that will take you 15 extra minutes on average.
The idiocy of the suggestion is that getting people onto trains they don't want to be on masks the problem they're seeing right now - that the "unnecessary trains" they removed are now packed to the gills as empty train after empty train of the new routes roll through.
As a yellow line rider, I love that I can pretty much stretch out in a row of seats every day. Sucks for everyone else though. In essence they've taken a situation where the scales are tipped 60/40 in the wrong direction and dropped a comically large one ton anvil on one side. Like building massive uncovered escalators or using train layouts that every other city on the planet of any size has long since abandoned, it's metro as usual.
i don't get why that would take more time i guess. it isnt like the train vanishes... if you take orange to lenfant instead of blue that same blue train will still be there.