That's not why it was assigned to land units.
The first delivery of an F4U-1 was on 31 July 1942.
VF-12 completed carrier qual by April of 1943.
Starting May 1, 1943, VF-17 landed F4U-1's and eventually all pilots got their five traps. VF-17 deployed aboard Bunker Hill with new F4U-1A's from the factory September 10 of '43.
So, VF-12 and VF-17 successfully completed carrier qual with F4U-1's.
From Tom Blackburn's book:
"The trip to the West Coast was uneventful, and they sortied from San Diego on September 28.
But a few days out, official lightning struck. VF-17 was detached from Bunker Hill, and ordered to the island of Espiritu Santo, to operate as a land-based squadron. The problem was one of logistics, not of operations. The high command knew that Blackburn's Corsairs could operate from a carrier. But as the only Corsair squadron in a Navy full of Grumman Hellcats and Wildcats, supplying and maintaining them would be a headache."
It ought to be noted that VF-17 qual'ed with little difficulty. IIRC, one guy made a hard landing and broke a wheel. That was about the worst incident.
The Royal Navy also had no trouble with carrier qual. Fleet Air Arm units were created and equipped in the US, at Quonset Point or Brunswick, and then shipped to war theatres on board of escort carriers.
The first Corsair unit of the FAA was No 1830 Sqdn, created on the first of June 1943, and soon operating from HMS Ilustrious. At the end of the war, 19 FAA squadrons operated with the F4U. British Corsairs operated both in Europe and in the Pacific.
I think logistics is it... as he said:
But as the only Corsair squadron in a Navy full of Grumman Hellcats and Wildcats, supplying and maintaining them would be a headache."