Can't see an issue either, using crimps. After all, correct me if I'm wrong, isn't that what Waggo's are effectively?
No, Wagos are a constant pressure sprung connector. The problem with crimps is that all copper will "move" when electricity flows through it (which is why you will find what was a tight connection on a switch or socket has become loose a few years later), and if this occurs within a crimped connector then contact can be lost. With multistrand cable, this doesn't occur, as the strands have been displaced to a point where movement is negligible.
All that said, provided the crimp is fixed with a good quality ratchet tool, and the cable either side is supported with heatshrink (preferably adhesive lined), then you will find that the connection will usually give years of service.