It is a little weird that it does not work with Fire/Android tablets or Kindles that use USB mass storage. It just says 'USB File Manager', nothing about MTP, and there will be folks who just use the Send To Kindle feature, have USBMS Kindles and might wonder why it doesn't work.
OpenMTP is still going to be my go-to tool; it tends to crash if viewing /system/thumbnails but otherwise works for me. (of course 'there can be only one' MTP client so you need to disconnect calibre if it is connected)
libmtp provides a command line interface that is sometimes useful too.
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