That’s not what it’s meant for. It’s for short term removal and refitting eg cleaning behind the cooker.
A decent Gas safe registered person would leave it like that.
Maybe so, but perfectly legal
Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
Discuss Is white PTFE tape allowed on gas fittings these days? in the Gas Engineers Forum area at Plumbers Forums