Beat matching is useless. But, while you're learning to do it, you learn phrase matching and track structures (hopefully). If you can learn that on your own, fine. If you don't learn that, it will always be audible in your mixes.
I also don't understand what you're supposedly saving time for. Everyone I've heard use that excuse just doesn't seem to understand anything about what they're doing (Ritchie Hawtin aside) and adds useless garbage to ruin every song they play. Or they do things in a harder way than they have to just to show off what you can do with sync.
I–on the other hand–use sync because it's there. It works fine. I can fix it when it doesn't work. And there's nothing even remotely artistic about sync. It saves trouble.
That being said, if CDJs incorporated key shifting and–now that I've grown to love it–'beats to cue' in a reasonably priced player…I'd switch without hesitating.
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