Out with the old. In with the new. Some investors might think that's Cathie Wood's strategy these days. And they'd have a point.Wood's Ark Invest exchange-traded funds (ETFs) have been trimming their positions in several stocks that Wood once championed. In particular, she is selling two artificial intelligence (AI) stocks. Should you sell them too?1. TwilioYou might be surprised to see Twilio (TWLO 0.52%) as one of the AI stocks that Wood is selling. After all, it was only a few months ago that she named T ...