Possibly many 'asymptomatic' cases are actually 'no unusual symptoms'.
I know several people who didn't feel out of the ordinary but tested positive on a routine test, then attributed day-to-day 'symptoms' to the Covid. For example, one had a mouth ulcer, which she wouldn't have remarked on but for an unexpected positive test. She's had them over the years. She didn't notice anything else, even over the next days.
Lots of people are coughing and sneezing at the moment and I can actually see the pollen in the air at times. I generally have a scratchy throat at this time of year. In 2019 I hadn't heard of Covid, in 2020 there was no routine testing. This year I am doing regular lateral flow tests (sometimes daily if I'm volunteering in different places) and they've all been negative. But if I were to get a positive I'd attribute the exact symptoms that I get every year to Covid. So, if I had no other symptoms, would I be 'symptomatic'?