So here’s a fun mental image.
Rockets can get to the ISS in a couple minutes. Go straight up, intersect the path, and you’re good!
Except now the rocket is essentially a deer that’s run in front of a car on the highway. It’s going to be a mess.
If you don’t want just a mess, either the car has to slow to about the speed of the deer or the deer has to speed up to the speed of the car. One of those things is unlikely.
With rockets, it’s stranger. If the ISS slows to the horizontal velocity of the rocket, it’ll just fall from the sky. Bad day. So the rocket has to speed up instead.
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