I was really impressed. I did some prototyping with RFID a few years back and reading multiple cards in unpredictable positions (e.g. overlapping, side-on) was quite challenging but looks like decathlon have worked it out.

I personally can't see myself switching from my local store even if it takes like 3 more minutes to check out. Maybe I'm just lucky though to think it's 3 minutes extra at most?...

If checkout lines are supply constrained (eg. there are always lines) then increasing speed increases throughput which increases revenues.

If checkout lines aren't supply constrained (eg. there are empty checkout lines) then you can reduce the number of open lines without increasing wait times, reducing your headcount and driving down your labor costs. If you lower your labor costs you reduce your semi-variable costs and you can keep the same contribution margin and lower prices.

Have ever been inside a walmart? There's only ever like 2 checkouts open and massive lines, that's a long time to stand there.

Waiting in line at the grocery store I thought was one of the most common annoyances people have?

Perhaps I am an impatient outlier, but whatever the profitable wait threshold is, it could be maintained with fewer cashiers if checkout were faster.