I like to see some suspension movement because the compliance contributes to mechanical grip, as opposed to grip caused by aerodynamic downforce. However, I believe low ride height is way over-rated as a factor causing bad racing.
Excessive total downforce is the enemy of good racing. People use "low ride height" as a proxy for "high downforce" but this is an incorrect and over-simplified assumption. There are other ways to generate too much downforce, even with the cars up off the ground. And the total design can produce moderate downforce even with the cars slammed down on the track (and with better safety).
Many people focus too much just on ride height... "Get the cars up off the track like back in the old days." This just invites Nascar (and Marcus Smith) to use other ways to feed us a steady diet of flat-footed WFO pack racing.
So be careful what you ask for. I want off-throttle time on intermediate tracks and actual braking, with a sizable difference between straightaway speed and midcorner speed. That's what emphasizes driver skills. I don't care if that is achieved with ride height or other design factors.
[End of rant]