It's a time-consuming endeavour, to be sure, but one I gladly do.
If you've landed here because someone linked the Tier Guides to you or happened to read a pin about them, chances are you already know what these are all about and why the insistence on them being called 'Tier Guides'; on the off chance you don't, here's the long and short of it.
The Tier Guides are less of a tierlist and more of a compendium of all the relevant units in the game: they are meant to tell you who's good at what, why is it good at that and how good it is, not who you should be using as that is a very subjective thing and different players value different characteristics differently.