It's insane how overpriced Apple is right now.
Profits: $11B. So stock market is saying they're worth 19x as much as they make in a year. Also, this is steady state - there's no reason to think spending will go down or revenue will go up. That's why Apple is already paying dividends. Which aren't very good.
Diversification: Mac sales are down. Apple is even more dependent on the iPhone than ever. If someone rolls out the thing that turns the iPhone into the iPod, Apple has nothing to fall back on. Also, growing services is really just growing profits per iPhone - there's no reason to think that when the iPhone becomes irrelevant, their services would survive.
I see Apple as very risky with little chance of reward. I bought at $140 last year and sold at $190. Great that it jumped to $200 - we're getting closer to the edge. You can either sell now or fall off the cliff.
I'll buy back in when it's down to $160 or so (assuming nothing changes. If that mystical iPhone disruptor shows up, obviously I won't be buying Apple at all.)
Folks have been saying what you've written for ~10 years. Of course, if someone keeps predicting doom one day they will be right. In any case, stock picking is a luck game, index funds and move on with your life.