Except they didn't do that with the Wii. With the Wii they planned on a possible feeble start, they had just come off the GameCube. When they saw demand was exceptionally strong, they immediately set about raising supply as fast as feasibly possible. The Wii shattered records not due to artificially restricted supply, but due to demand that outstripped even the most prolific supply. And the Switch's first shipments were not nearly as conservative, they put over 2.7 mil on store shelves in a month. And sold nearly all of them. Despite that month being March.
And sales cannot be simultaneously very high and supply artificially constricted. The supply has to BE THERE to be purchased.