In my eyes, buybacks are good. It reduces the number of shares available on the market, and when supply goes down, demand goes up. I don't see the demand for Apple products going down enough to make me sell my Apple stock. I know the stock price has been down recently due to talk about the demand for the iPhone X, XS, and XR being lower than expected.
Personally, I don't care. I'm holding Apple for the long term. I don't have an iPhone, but I do have an iMac, and I've been very happy with it.
FYI - I'm not encouraging you to buy Apple, so don't read my blog as financial advice :) I'm just sharing what I'm doing and what I think.