Not true...go rewatch TOS S3 - "The Day of the Dove" (Spock specifically states it's not impossible, just that it's rarely been tried because it IS dangerous - however he's talking beaming from the transporter chamber to another point in the ship; NOT the reverse - which should be easier...beaming someone inside the ship INTO the Transporter chamber.
^^^
And even if it IS dangerous for the person involved either way...at least it's a better chance than say, CERTAIN DEATH.![]()
That happened nearly a decade later. The Pike era shows something quite different even for having what look like more advanced ships.