But most small independents would be exempt from business rates due to the small business rate relief,
Suppose you are selling custom wotsits.
If you have a high street shop in Sometown, you can a custom wotsit to everyone in Sometown who wants one, if they can be bothered to come into town. You might pick up some passing trade, but you're selling custom wotsits which are a hundred quid and require a second visit to collect.
And then you go out of business.
If you have a web presence, you can sell custom wotsits to the world wide wotsit community, without the cost of keeping a shop or paying someone to staff it. You have to advertise, but you had to advertise anyway. If you advertise locally, you have the same customers for less cost. If you advertise more widely, more customers.
Unless they are local wotsits for local people, how can you lose?
Councils, and proponents of the "high street" think there is a large, and growing market consisting of people who want to buy new things they haven't bought before, have the money to buy new things they haven't bought before, and won't shop online. These people do not exist. They might have existed twenty years ago (people in their fifties, born about 1945, nervous about the new online trade, but still in work and still interested in new thing), but now there are:
(a) One or more of older, less well off, less well educated people who won't shop online, but also don't have a lot of money and are conservative in their tastes
(b) One or more of younger, better off, more educated people who are perfectly happy to shop online, have some money and are interested in new things.
There is no significantly sized (c), of people with the money to spend in small independent shops, the time to go to them, the inclination to shop in them, and something stopping them from doing it online.
Those are the facts. People might not like them, but they are the facts. What we do with them is a separate problem, but pretending it's all a bad dream and we are all going to wake up in five years' time in "Janet and John go High Street Shopping in 1958" is not a business plan.