1. Not to get too pedantic, I hope, but Macs have certainly not "always" had standard ports -- before USB, mice and keyboards used ADB! In fact, Apple were fairly early adopters of USB, and arguably
helped make it a de facto standard for desktop peripherals.
Firewire was also a technical standard but never became widespread; if I recall, it was Apple's attempt to push against the converging industry standards with what they saw as a technically superior solution. But only Apple and Sony ever bet on Firewire in a big way.
If Lightning is never used in a master configuration, how come you can use it to plug headphone into an iPhone? It wouldn't have made "no sense" to put Lightning connectors on Macs (although I definitely agree it wouldn't have been wise and I'm glad they didn't).
MagSafe is another non-standard Mac thing -- which was replaced with USB-C and then came back again, very unusually for Apple.
So, they certainly haven't always have standard ports, and Apple have not always been consistent.
2. You don't need USB-C to have your device act as a host, whatever the marketing material might say. USB On-The-Go has been around for a long time: https://en.wikipedia.org/wiki/USB_On-The-Go The advantage of USB-C is that it gives you access to a wider market of third-party peripherals -- I'd say Apple saw the way the wind was blowing, and decided to sacrifice the control and fat margins you mentioned in favour of a better overall product.
Apple has only one goal in mind - their margins. Everything they do must be seen in function of that. It's clear Apple is going to remove every single port from the iPhone, they only have to find how.
I agree that they love a fat margin, and feel entitled to it, but I don't think that's quite the full story. Maybe I'm buying too much into the reality distortion field, but I think they genuinely believe they make better products due to their unique approach. That involves exercising strict control where they can (walled garden app store, proprietary connectors) and aggressively removing features that 10% of users rely on in order to give what they see as a better experience for the 90% (e.g. removing headphone jack); but sometimes also bending to market forces and embracing standards when they think it benefits users -- sometimes very early indeed. Think of the 2015 MacBook, which launched with just a single USB-C port for everything, when USB-C peripherals hadn't even become very widespread.
The test of all this will be whether iPhones continue using Lightning, or switch to USB-C. I'm very confident that they'll switch, in either the next revision or the one after.
It'll be a painful switch, but Apple is very good at powering through those (ADB to USB, 68K to PowerPC, removing floppy drive, removing CD drive, PowerPC to x86, 30-pin connector to Lightning, removing headphone jack, x86 to ARM). When they make up their mind to switch, they make it happen very quickly.