Fire OS, Amazon's fork of Android, has been updated to use Android 11, which is still two full versions behind stock Android. Other than the app-switching screen and few minor theme details, I couldn’t tell much of a difference. Fire OS still offers the same basic experience, which isn't necessarily bad, but is limited by its app store.
Out of the box, Fire HD 8 tablets do not offer any Google apps or any access to the Google Play store. The selection in the Amazon app store is what you might call lacking. Want to watch YouTube? Chat on Slack? Nope, not happening. Even if you want to argue that this is a tablet mostly for consumption and doesn't need much of what's in the Google Play Store, YouTube is a glaring omission. My suggestion would be that if you have specific apps you want to use, browse Amazon's app store before you buy to make sure what you want is available (if you have an Android device, you can download and browse Amazon's app store here).
What about "sideloading" Google Play? We do have a guide on How to Install the Google Play Store on an Amazon Fire Tablet, but unfortunately that guide doesn't work for this model. Or at least, it doesn't work with the current version of Fire OS. Some Reddit users who have received a software update to Fire OS 8.3.1.3 claim that they have been able to install and use Google Play. My review unit is so far stuck at Fire OS 8.2.1.2, which, I can confirm, will install the Google Play Store itself, but does not allow you to log in and install any apps from it. I will update our guide with info on how to do it once I can confirm that it works. At some point, you likely will be able to install the Play Store, but you can't right now.
Amazon's 2022 Fire HD 8 remains good at what it is designed to do: stream Amazon content. If you're a Prime subscriber and want a small, affordable device to use on the couch, in the kitchen, or even with a stand to impersonate an Echo Show, the Fire HD 8 isn't bad. But if you can afford it, the 10-inch model offers a much better overall experience and remains our top pick. If you really want to score a deal, wait for the next Prime Day to roll around, when, typically, Amazon's Fire tablets can be had for half-price.