The question then becomes, would they last long enough without the above interventions. Maybe shaver heads would cut effectively for a year without doing anything. Or two years. The lifespan of a modern electric shaver is dependent on its batteries, probably on the order of 3 or 4 years, so you might need to change the head only once in the life of the shaver anyway. Or not. All valid considerations, maybe worthy of peer-review. But rounding back, for rationale, see sentence #1.
Just for a moment; allow me to digress from the original thread.
The lifespan of a modern shaver may only partly dependent on the life of the battery, as the battery on at least some brands can be replaced.
I just had it done by the local Braun service centre on a rarely-used, 2012 Braun Series 7 and it costs the equivalent of €17/$18.
(And yes, the service centre assured me water resistance will not be affected.)
Regarding lubrication, I expect lubrication to reduce wear and tear on the Braun shaver cassette, no matter whether one uses the automatic cleaning method or you applies a drop of oil once a week, as the Braun manual suggests.
B.