When I first put my 95SR on the road the shaft bushings were in terrible condition. Clattered horribly. I ran it a few years with the hose unplugged with no issues. With the valves in the open position there is essentially no pressure pulses acting on the valves.
My second SR came with a new lower intake so that was swapped in. If there is an improvement in low end power or economy I do not detect it.

I do have experience with the electrically activated intakes on the 3.0 12V and the 3.0 DOHC in Diamantes & 3000GTs. Both these engine gain a great amount of power with the system disabled. With the 12V engine the valves open around 3K, the issue is the intake is to restrictive from 2500 up till the intake opens. The car could not torque up a hill at all, always needed to downshift to get over 3000 revs to climb. Once I disabled the intake valves the car would climb hills in top gear and I saw a 2MPG improvement.
Then I started working with the 3.0 DOHC, That intake opens at 4500 RPM, what a joke. The engine was just flat till the valves open then it screamed. I very soon disabled the valves and the engine pulls full strong from 3K and again a major increase in mileage. 27- 28 MPG average in a Diamante wagon driving in hilly country.
I expect if one could program in a lower opening RPM then there maybe value to this system.
Keep in mind these intake valves could well be implemented as a torque reduction system intending to reduce driveline loads as we have seen in the later Starion manual cars. In the Starion they use the dual diaphragm wastegate to reduce boost till upper RPM just to ease up on the gearbox.
In my Montero I have eliminated the little vacuum canister on the intake valves. What this allows is the valves to open sooner when the manifold pressure drops under load. I do need to do some testing to see in this engine is better with or without the valves.