Significance:
Should the reverse be true, two grounded walk-cancel AA1s from Klee would allow you to switch characters immediately after the second without any downside. However, as it stands, players looking to maximize the benefit from the talent's charge attack buff will want to look for the proc before swapping, bringing two grounded AA1s closer in-line to - AA1 > AA2 > jump cancel combo. As for why you would want to swap characters frequently from Klee in the first place, that would be to set up reactions manually, or refresh Viridescent Venerer 4pc effect. A rotation could run something like this: