So what do you two suggest then....more avionics to look at INSIDE the cockpit?
Yes...as an instructor you are very busy BUT maintaining traffic separation in VFR/VMC conditions still requires you to look OUTSIDE.
Even with TCAS and other Traffic Advisory assistance....you still have to rely upon the MK I Eyeball.
Aircraft with limited over the nose visibility should not do straight ahead descents....as there might just be traffic under the nose....that is why clearing turns are taught (or were taught in the old days).
I, as all too many others have, have had some very close near misses while instructing or passing by/near uncontrolled airfields. Each time it was due to a breakdown in vigilance for any number of reasons.
It is a very large Sky out there until it is not.
Teaching is second priority to safe handling of the aircraft.