..The difference is that there are treatments for e coli and salmonella. And yes we are rather careful about these other pathways. The one I think about is the fortnightly bin collection. I have no problem putting the bin out with bare hands, as it has been sitting in the rain and sun for 2 weeks, but I do ensure I take it back using a paper tissue. The bin collectors will have perhaps touched 200 bins in the 3 hours before mine, and even if they have gloves, any one handle could have been infected.The covid on salads thing has been kicking around since the very beginning of the outbreak but the thing is it's multifactorial (gotta love that word) there's many other things that surround the production of fresh foods that could lead to contamination.
Take packaging for example how many times does that packet get touched by human hand before it ends up in your fridge, much more so than the lettuce it contains but do you still sanitize the container like I do ?
Shifting the argument slightly how about your mail, do you still handle it with your bare hands as you always have done in the past. Cardboard & paper are notorious for holding onto the covid virus for days on end, personally I still use gloves for mail with important letters stored in folders for future perusal when covid safe.
Do you sanitize your door knocker/bell or your front gate, how far do you want to go?
Going back to fresh foods, there's far more danger from other diseases like salmonella & e-coli than covid on your cucumber believe me.
I think the problem with cardboard is overstated. ..the material will dessicate the virus. More worrying would be the plastic milk container, held at low temperature in the shop