In reply to Rigid Raider:
> The last time I climbed on an artificial wall ...
More than 20 years ago?
Indoor walls nowadays generally have a fairly large area (say about 50% of the wall space, maybe a bit more in a big place) given over to indoor leading in which the climber clips runners as they go, like outdoor sport climbing.
Describing a climbing partnership indoors as 'leader' and 'second' is very outdated. You're not a 'leader' unless you're leading a route these days, and nobody is a 'second'. A partnership consists of a climber and belayer, or perhaps leader and belayer if the climber is actually leading.
I tried belaying with a fig-8 briefly, while it was briefly trendy back in the early to mid '90s. (In the style of the time, which was to use it as a kind of over-sized sticht plate.) Now there was a belay device that really was dangerous - *way* too slick even with fat furry 11mm ropes, and with the potential to break open the gate of a screwgate krab under certain (mercifully fairly unlikely) circumstances. Even then accidents were extremely rare, but it's probably a good thing the fad didn't last.
I think I bought my original ATC around that time. It is/was a Black Diamond belay device, the ATC stands for "Air Traffic Controller" - just a brand name, nothing meaningful. The OP isn't outraged that the one specific device has been banned, the ban extends to all forms of traditional belay plates. (In spite of their decades long record of impeccable safety.)