Yes you have to find /pattern fish but you have to have the ability to move too. The difference between 3/4mph and 6 is tremendous in even making it to your spots.
You also see the pros moving, frequently miles to other productive areas,,,,,but not at 3mph against a head wind. Distance is unrelated between boats and kayaks. Pro boat fishing is not relevant to kayak fishing in the least.
I’ve said nothing about rouge roaming at all. Having an “area” is more important than a “spot” to me. With the right pattern I can fish effectively any area that I can get to so staying in a “spot” is less productive once it’s fished through it.
I know of no tournament kayak fishermen that fish only one spot, at least not long and when they move speed is vital, as @Koz stated. A spot is a quarter mile bank and an area is four/five miles of bank. That being said, spot lock becomes less valuable in the overall scheme of things. All in all I’d say a pedal kayak is of greater benefit in addition to a great motor than spot lock.