If I buy a switch and that thing decides to give me downtime in order to auto update I can tell you what lands on my blacklist. Auto-Updates absoultely increase security but there are certain use cases where they are more of a hindrance than a feature, want proof? Not even Cisco does Auto-Update by default (from what I’ve managed to find in this short time neither does TrendNet which you’ve been speaking well of). The device on its own deciding to just fuck off and pull down your network is not in any way a feature their customers would want. If you don’t want the (slight) maintenance load that comes with an active switch do not get one, get a passive one instead.