First, that's not how bitmapped printers generally work on the Mac - the computer renders everything, and the printer just has to receive, buffer and put the bits onto paper. The challenge Apple had was that while they were making a fortune selling printers (80% attach rate, over $1B/year revenue!) they felt that the Mac was locked into a "ghetto" of a limited number of compatible printers, which they felt limited Mac sales. So they gave up the $1B a year printer business, and in return got HP, etc., to add Mac support, so now Mac's could print with a huge range of printers, and Mac sales went up ($4B in revenue the next year). They didn't have to get out of the printer business - it was huge, growing, and highly proftable. But they felt it held the Mac computer business back, and made the strategic choice to maximize computer sales.
I didn't say that Apple's digital camera was the first, I said it was the first consumer-friendly camera than you could just take pictures, plug it into your computer, and the photo's automatically copied into your photo library. I used early digital cameras, and they were beasts - weird file formats, weird cables, weird software, ... it could all be made to work (and I had a digital camera back strapped to an SLR back in the day) but it was a horrible user experience. The QuickTake was the first consumer digital camera with a good user experience. That showed camera companies what to do, and when enough of them copied the QuickTake, Apple killed the QuickTake and sold the Kodak, Canon, etc., cameras, because their goal wasn't to sell QuickTake cameras, it was to position the Mac as the creative platform for photographers. Which was a brilliant strategy that Apple sold a ton of computers with.
Yes, ethernet predated AppleTalk. But when AppleTalk came out, ethernet interfaces cost hundreds of dollars per device, and thick coax cabling used by Ethernet was very expensive and very fragile (bend with less than a foot radius, and you get to replace your $100 cable), and very hard to get working (with ringing, etc.). In contrast, AppleTalk was very easy, the interface was built into Apple computers and networked printers, and the cabling was cheap and easy to set up. When, after several generations, ethernet got as cheap and easy as AppleTalk, with cat-5 replacing coax, etc., Apple killed off their proprietary networking and adopted ethernet.
Apple's routers aren't targeted to network admins who want to configure every tweaky detail (and I know, I am one). Apple's routers are targeted to consumers who want to plug stuff in and have it work painlessly, which, despite your disdain, their app does a great job of. Normal people HATE linksys routers, and the like - it's by a wide margin the single biggest pain point in getting consumers onto the internet. They don't want to know about DNS and BGP, etc., they just want their stuff to work and be reasonably secure. And the latest generation routers are getting more and more consumer friendly, with (for example) mobile and web apps, to configure and control the router in ways that make sense for consumers who don't want to be network engineers. So while you and I like "real routers" don't forget that consumers really, really hate dealing with that complexity.
I'm surprised that you don't see the relationship between ADB and USB. Apple invented ADB as a bus for connecting devices like keyboards and mice, back when PCs were using serial ports (i.e. not a bus). This gave Mac's a cheap and easy way to plug in multiple human interface devices (keyboards, mice, joysticks, etc.). And when Apple and Intel developed and launched USB, Apple killed off ADB and switched Mac's ports to USB. The logic was similar to with printers - they killed off a proprietary port that was making them money selling peripherals, replacing it with an industry standard that gave Mac computers access to a wider range of peripherals.
As a plus, USB was also fast enough to be used for external hard drives, so Apple killed off SCSI to simplify Mac port confusion and improve the user experience.