After having a Nexus 6P, I think I'd find it pretty difficult to go back to not having a fingerprint sensor. It's just such a convenient way to quickly and easily unlock my phone. The Sony Xperia XZ and X Compact (this year's model) both have fingerprint sensors, but weirdly on the US editions (and possibly others from around the world), they are disabled via software. Xperiablog has found that by flashing the UK firmware, the sensor can be enabled.

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Left: US firmware - 1304-9206. Right: UK firmware - 1305-2216.

A thread on XDA details the process - in essence, download and install Xperiafirm, Xperia Companion (from Sony), and Flashtool. In Xperiafirm, find the UK firmware for the respective device. From the files you downloaded, delete the fwinfo.xml file. Then, with Flashtool, convert the firmware into a single .ftf file, and then flash that to the device. More info can be found on XDA, with a guide from user drrobo, of course, as well as download links to the three tools needed.

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With the UK firmware flashed, fingerprint manager shows up in Settings.

Once flashed, you should have an XZ or X Compact with a working fingerprint sensor. The UK firmware doesn't appear to have any disadvantages - T-Mobile LTE still works, according to the XDA thread. Be aware that flashing the device in question will wipe all data, so back up before if you need to, and as always, if you don't know what you're doing or think you'll break your phone, back out.