Pretty sure the laptop I had from like 2012 until 2018 could do that. Haven't tried anymore since (haven't played around with deauths) but I thought this was common functionality

Consumer router firmware UIs, typically owned by ISPs, I'd not expect that yeah. Some don't even let you pick a WiFi band anymore and require other changes to be submitted through an ISP portal on the web somewhere (thinking of Belgium here, not sure which ISP it was)