Love it.
My wife and I are a part of the problem for the demise of the High Street (although the Lockdown will most likely do a better job).
We were early adopters of online shopping, and have had deliveries from Tesco from when they first started - a nice unintended consequence is that you buy what's on your shopping list, whereas pushing a trolley around a supermarket, you invariably end up going off-piste and buying more.
With clothes shopping, because sizing from pretty much all manufacturers can be so different, we order three of everything - our normal size, one below and one above, and then take the other two back, which is no real hassle and by and large free postage.
When my kids were younger I'd take them to Toys R Us, see what they wanted, go home and order it from Amazon at a discount.
I've bought cars and motorbikes online.
My son needed a webcam for his PC recently for his online lessons, ordered it from Amazon Prime at about 10am, and it arrived about 5pm the same day - absolutely astonishing service.
So I don't actually think there is a downside.