You have to explain these flaws. Giving two isolated incidents as an example of a flaw is nonsense because, by that standard, no stat can possibly be "flawless" and by the same standard, all the older stats are WAY more flawed.
Take the example you gave. OBP treats a first pitch infield single and a 13 pitch walk the same way. It treats a regular walk and a 13 pitch walk the same way. So does OPS. RBI treats a game winning solo home run and a sac fly in a blowout the same. Slugging treats a one pitch infield single infinitely more favourably that a 13 pitch walk. So does batting average.
So, you're going to have to explain, given the standard that you yourself have set, why wOBA is more flawed than literally anything else out there and why you'd ever use other stats in lieu of wOBA when they are demonstrably more flawed.