Here is the logic. It's not my logic. But it's the logic. An increasing number of posters are detailing their experiences of using self reported lateral flow tests as "proof" of reduced risk of Covid transmission in order to attend events. I'll sum up as - it's hit or miss, you can choose your own result if you really want to attend the event, it's ridiculous.
In earlier & current days, before the whole of the adult population had/have the chance to be double vaccinated, there was/is little choice but to allow a Double Vaxxed Pass OR a self reported negative lft. Although that will reduce risk, it's clearly sub optimal.
That is why "from September" the Government will pursue either .... let all comers into events OR require a Double Vaxxed Pass or Exemption ... logically it seems unlikely they will continue to accept a self reported negative lft once everyone has been offered two jabs.
There is another way of looking at it. Either "the vulnerable" "the wary" can be asked to take the hit for the team, not attend events and "let the rest of us get on with our lives".
Or. "the choose not to be vaccinated" "the wary of the vaccine" can be asked to take the hit for the team, not attend events and "let the rest of us get on with our lives".