I think dragonfly is right.
The 2 are linked. If you have an aero deficit, you will work the tyres harder. Mercedes W03 is an evolved step of the W02, which had a big aero deficit.
Since then we have seen the introduction of the triple element front wing, along with the clever drs duct and extended wheelbase.
And it works, but only over a single lap.
My opinion is that Mercedes need to adopt the aggressive exhausts simply because the gain, however small, would still yield a decent return on aero points and critically, tyre degradation.
Which 2 teams appear to have very good tyre management? Sauber and Red Bull. It's possibly coincidence, however I don't think so.
Adopt an agressive exhaust, gain more DF points in the wind tunnel, and let's see.
Not much else they can do this year.