What sort of in-switch testing have you seen/experienced? I’ve only seen very basic (as you’d expect) TDR tests that can measure cable length, and open/short pairs. That’s it. I wouldn’t really say that’s comprehensive - certainly not when compared to an objective, dedicated cable test tool. On the other hand against a basic continuity tester they are OK.

Fair point on external cable runs, but personally I have a pathological hate of running structured cabling between buildings externally. It’s done, I’ve done it took, but it’s [censored] really. Much safer and better to run a short pre-term armoured fibre (like the GI Invacom use for fibre-IRS TV) and pop the ends into a baby switch or media converters. But we’re getting way of course…