I think all the bloggers have overlooked the biggest reason Apple is getting out of the router biz: most every ISP in the country now, or will soon include router and wi-fi capabilities built-in as part of their modem hardware.
Hard to compete with "free"...
If you use your ISPs router hardware as your internal WiFi or Ethernet network then you simply do not understand or value your family's security or privacy. Connecting your devices to a router that you have no control over subjects you to any and all of the evils of your ISP, botnets, state actors, etc. (e.g. your ISP and many IoT bots can change firmware or settings on you at any time).
In addition, 'Hard to compete with "free"' is a ridiculous statement. First, you have already, or are continuing to, pay for that ISP provided router every month in your bill. In addition, as has been said a million times by others, when a tech company is providing you with something for free, then you are actually the product. In this case, monitoring and selling data on your family's Internet usage, injecting ads, deep packet inspection, interfering with competing services, and throttling your connection come to mind.
It's unfortunate that home users, and most tech bloggers, simply cannot be expected to understand the threats associated with using an ISP-controlled router/AP. Nothing is bulletproof in the current surveillance world, but at least you can purchase a router that you control, lock it down, use a VPN, and use HTTPS to minimize the threats. Fortunately, Apple's routers have been rock-solid in terms of security and reliability over the years. Those of us that value these things continue to hope that Apple is just working on something more modern instead of actually discontinuing a great product. When and if they hopefully release some type of mesh router/AP in the future, I'll buy it (I'll immediately disable Siri and whatever other IoT crap they build into it but I'll buy it nevertheless).