though you can never blip to the exact rpm each and every time, the engagement isn't entirely perfect either during an upshift ...whether you're just driving normally or shifting at or near redline.
I can't speak for others, but I'm decent and don't vary much during downshifts and I suppose I can say that I've ruined a fair bit of clutches and transmissions along the way to "perfect" my skillset.
If anything, the syncros would likely take the most wear and tear...unless one is prone to ol'skool techniques of double clutching.... you know...like a certain somebody.