I grew up in a 'it has to be darker than that' roux family lol. It didn't matter how dark it got, someone would ALWAYS chime in that it wasn't quite dark enough. I go just a touch lighter than most other native coon a$$es though, so I'm a rebel.
I'm in the file' no maters/okra camp though. I don't mind it with maters and okra, but my kids won't touch it if I do.
I can only get file' at one place locally. Harris Teeter and I buy 2 at a time. I will totally buy that shiznit on amzon if they quit carrying it.
There is a little trick you can also do to thicken up gumbo. Make some lighter roux in addition to your dark brown roux - not quite blond but not too brown - and add it in with no more than 10 minutes of simmering time left. The dark stuff always goes in early. The lighter the roux the more thickening power it has, but it can't cook too long or it will break.
I just realized that I'm not going to be able to eat gallons of it this winter on keto. Quarts will have to do on cheat days.