Bones, some tyres take no time at all to bed in but many do.
I've only ever had 2 sets of tyres on my own vehicles in some 48 years of driving that were 100% from the start. Vredestein Wintrac Extreme on a Hilux and the current Yokohama GO15s on my 120, coincidentally both snowflake stamped one winter rated one rated all season, as are the BFG AT's if my memory serves.
Everything lese fitted new has given to a greater or lesser degree that 'light' feeling to the steering, that you get from damp salty roads, until enough mileage has been completed to bed them in.
Bedding in is the term used, but maybe scrubbing off is a more accurate description...note i have no doubt this can have an effect on tyre tests, presumably the testers take this into account or maybe they get the treads buffed on brand new rubber, i don't know but would be interested to know.
As a rule don't expect the best from car tyres for 1000 miles, circa 2000 for the sorts of tyres on our Cruisers.
For lorry tyres reckon on 5000 miles.
Yes seriously, for my sins i drove car transporters for 20 years, the later vehicles are an inherantly unstable design, look like an artic but handle nothing like one, when youj either collected a new truck or had a new set of (drive axle in particular) tyres fitted, the first few days especially were nothing short of terrifying, it felt like even on dead straight roads that the prime mover (tractor unit) was gong to go into an oversteer, many times worse on bends.
My mate described it perfectly one day, like trying to drive a plate of spagetti, never heard a more accurate description.
By the end of the first month, which usually equated to 5000 miles or so they would settle down.
See what its like after a while, in the meantime you've obviously checked tyre pressures?
Running mine at 30 psi during winter which i raise to 35 or so during the warmer weather.
Motorcycle tyres i have no doubt are either buffed up or maybe use a differernt technique at production for obvious reasons.