At first I had an issue with this, but after considering every angle I have changed my mind. This is my logic:
1. Many thousand tons of e-waste every year are chargers. This will help to reduce that.
2. If you need a charger, you have zero obligation to buy one from Apple. You can get a cheapo on Amazon or at a discount store incredibly easily.
3. For 99.999% of the population, #2 won't be necessary because they will have multiple compatible chargers already sitting at home, or a wireless charging pad, or a computer USB port they could use.
4. The resale argument holds zero weight because if you don't get a charger with a new iPhone why would you expect to get one with the same iPhone that is used? Also, if you are worried about Apple making too much money and getting out of touch with consumers then maybe upgrading your phone every 6-12 months is kind of encouraging that? We've reached an era of incremental improvements or outright stagnation in most tech. I fully expect everything going forward will be just variations on the same theme with no actual improvement in functionality, and it may be that way for a long time (like color TVs). Your phone should last 2-5 years at least. If you want the latest and greatest (because let's be honest, nobody really needs the latest flagship smart phone) then expect to pay a premium.
My opinion, many won't agree and I appreciate that.