I began an entry in July of 2018 with this:

The Amazon Kindle Fire HD10 (2017) is the high-end tablet of their line. The hardware is mediocre and the software is quite bad. I do not recommend you purchase this or any other Fire tablet… unless you have some very specific requirements.

I can now say this:

The Amazon Kindle Fire HD10 (2019) is the high-end tablet of their line. The hardware is mediocre and the software is quite bad. I can recommend that you purchase this tablet if you are comfortable with the use of adb and command line tools. It is cheap ($95 on Prime Day) and capable of doing a number of useful things, such as…

• reading comics
• reading ebooks
• watching YouTube (I recommend NewPipe)
• watching other video streaming services
• controlling other electronics when a web-based or Android control application is available
• casual web browsing (get Firefox, install uBlock Origin)

There are guides on xda-developers to installing the Google store (you’ll need 4 apks), installing a new launcher, disabling the horrendous Amazon launcher, and even installing a new keyboard, which was sorely lacking on the 2017 edition. All of those things require developer mode and connecting adb (the Android debugger) via a USB cable. If that’s not a mystery to you, and you aren’t looking to run high-end games, this is not an awful machine. And it is cheap.