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Would you mind explaining what you mean please. On my Series 3 you manually start the activity and stop it.
With my Garmin 935 then you select run and the watch sits there for a moment acquiring a reliable GPS signal. It then tells you GPS is strong and you're good to start running.
If I just start running then I often get a couple of minutes of wobbly tracking at the start of the run while the GPS signal is sorting itself out.
Same with swimming. It struggles to get a lock when underwater so you'll always see everyone at the start of a race waving one arm around out of the water to get a decent signal before hitting start.Apple watch seems to hide this bit from the user - so you may get a great signal right away (if you start in the middle of a field for example) or you might get a crap one (maybe if near a few tall buildings), but you wont know til you upload. And may be the start of the run has you zigzagging through buildings while it's figuring out where you actually were.
DC Rainmaker has written about this - the Apple watches will tell you that they've acquired sensors (HR, GPS) instantly. The reality is that they have not. You run/cycle/pogo-stick off, believing that the watch is recording what you are doing, therefore.
Now of course the watch will record what you are doing - but it'll miss the start of whatever your activity is, for a random period of time, and you can't avoid it doing this unless you wait for a period of time that you can't check, before you set off.