That's true-ish. But the thing about Wordstar is that it is a word processor not a text editor. Other word processors don't make this so easy. Also the standard keybindings for cursor control in Emacs are much less ergonomic.

^ = control

In Wordstar: ^S/^D moves left/right; ^E/^X moves up/down; ^A/^F word left/right; ^R/^C moves page Up/Down

Notice that all of those use only the left hand. In Wordstar almost everything to do with cursor control uses only the left hand.

Emacs is mnemonic ^b for left (back), ^f for right (forward), ^n for next line, ^p for previous line, etc. You need both hands and the keys are all over the keyboard.