"This. In tennis, the racquet is already in your hand so you have some understanding and control of its orientation at all times. It’s much easier to then shift the orientation of the racquet in your hand when you need to"
Interesting. Let's assume you are using the Eastern grip forehand and backhand to receive a 130 mph serve (fast for a woman, moderately fast for a man). The Eastern requires a 90° rotation of the grip in the hand between forehand and backhand. If you are good enough to crowd the baseline while receiving, you have about 0.42 second after server contact with the ball to react and rotate your grip. Average reaction time is about 0.2 seconds, leaving about 0.22 seconds to rotate your grip 90° (so grip positioning has to be at least as precise as grip positioning on a handgun with perhaps less time available to accomplish the transition). And this occurs simultaneously with the need to move up to five or six feet laterally in either direction during the same elapsed time.
The Continental grip doesn't require the grip transition, but limits the power of the backhand return, so isn't always advisable. My personal preference is for the Eastern backhand because of the enhanced power and control.
The Western backhand though quite powerful on high balls, requires a different grip transition and is OK for a high bounce return, but requires a power reducing contortion on low returns that is quite awkward.
On service, my grip is a Continental that varies slightly depending upon whether I am serving a renshaw, a reverse, an American twist, an Australian twist, or a cannonball - but there is plenty of time to accomplish that (I usually serve a renshaw, but with a slightly modified follow through to accommodate an old shoulder injury).
If you are a tennis player, I am sure you know who the Renshaw brothers were and don't require a description of their service motion itself.