I would suggest that "operating from a handy bit of road" given the complexity of modern aircraft and their ASE, munitions etc is about as practical as operating from a "ship of opportunity" - ie it's not!
My point was merely that "vulnerability" is always held up as a weak point of carriers, but applies equally to land bases. Both have ways round this - movement and active defences in a ship/group, dispersion / alternate bases for a land base.