Fascinating. What country? The only non-convection oven I’ve ever seen in Germany was the fire fueled oven my grandma had, and I’m pretty sure that thing was pre-war.
Canada. It’s a standard gas oven with a broiler inside. They’re for sale, but I’ve always lived in old houses.
Same here, in the US. Natural gas dominates where I live, and I’ve only seen it for electric ovens.
It’s also still a “new” feature, in the context of major appliances lasting decades. My new oven is convection but I don’t remember it being a reasonable choice 18 years ago when I last did, it maybe that’s just natural gas
And even today, this was a “premium” feature. Most low to midrange appliances do not seem to have it