Ignore COVID, cash is just dirty. If you've ever had to physically handle large amounts of cash you can see the dirt on your hands afterwards.
I used to cash up in the student union bar I worked in whilst at university. Believe me, cash was the nowhere near the top of the problems. Besides which, washing hands afterwards is amazingly simple. And I hardly think that people needing to wash hands after handling large amounts of cash is a good reason to scrap physical coinage and notes.
The thing is it's SOOOO much easier without cash (and consquently cheaper). When the social distancing rules were tighter we effectively stopped taking cash as everything had to be booked (and paid for) in advance either online or on the phone, therefore we weren't taking any payments of any kind in person. Now that we're taking walk-ins again and some people are paying with cash, the difference between a day with no cash taken (only cards) and a day with even only one cash payment taken is massive - it's a 45min difference to the end of day rountine.
I'm quite happy to use cards. But remember not everyone is. Not everyone is on board with this. Not everyone can. We have problems we currently haven't solved without cash - for example, victims of domestic violence whose partner is monitoring - or restricting - their access to their card based finances, but who may be able to just about squirrel enough cash away safely to allow them to escape. Or people on very strict budgets who need to monitor their spending and find cash easiest to budget.
Those are real scenarios and we must never forget that whilst the majority can happily use cards no problem, not everyone can or wants to.
I totally understand businesses wanting to get rid of cash. But society getting rid of cash is a very different thing.