I have an old (old enough for 7 speed shimano tri color at least) Cadex with lugs made the same way and apart from creaking while climbing, it's fine. I'm guessing (or thats what I keep telling myself) that it will start to "wobble" before failing? Feels like something Tester would know.
Mouthwatering! Look KG 251 lugged carbon frameset. 57cm. £149.99.
Would love one of these but how does one ensure those bonds aren't going to come apart underneath you?
https://www.ebay.co.uk/itm/Look-KG-251-vintage-carbon-frame-22-5-57cm-suitable-for-185-190-cm-height/224190361621