I shared your perspective for ~ 12 years. (Or at least since stablecoins were invented!) ... But when you are asked by a clearly very low-income user, who wants to be able to simultaneously survive & use Lightning.... I thought about it for a while and said "fuck it, this could be kind of interesting to try to implement, why not do it and show a big nasty warning before anyone tries to use it." Docs are here BTW:

How To Send USDT From Your Lightning Balance | Megalith Lightning Docs

Learn how to send USDT payments from Rizful, and understand the significant risks involved