In my opinion, I think two strikes is good, because it can ASSURE you 100% that the bytch isn't interested, by seeing if she flakes twice.
The first strike can be either way. She can just be legitimately busy, sick, tired, whatever the case may be. More often then not I would agree that its Low interest level if she flakes the first time, BUT there are always exceptions and to cut them off first strike, would mean missing opportunities and for me I AINT about missing opportunities
Hell, I've had it where the girl flakes with some ridiculous excuse, and I'm just like "ight low interest level, next" but gave her another chance and eventually killed the pvssy.
So thats why I personally will continue with the two strike rule.