To me it's not emphasising national identity. It's signifying a culture. A culture that has been heavily oppressed and is currently starting to slowly languish as the bigger and more predominant culture slowly smothers it. I've seen this happen in my own mind as my internal monologue switched languages after watching a lot of english TV and Youtube.
It's a shame that a language that is very different in it's construction is starting to slowly be drowned out just because the internet has made english the language everyone speaks. I have no love for the state or the national identity the flag represents. That's why I put a circled A on/next to it. To signify that I reject the state and the nationalism while accepting the culture behind that state.
The problem with nationalism, why it is nationalism, is the idea that only a certain group of people are deserving or valid in a culture. That speaking a different language or having different parents made you somehow different or superior or more deserving. It's a method of othering. This is the core idea behind nationalism and it's the one I (and every anarchist) reject. Everyone who wants to, is an estonian, no matter where they come from, it's a culture, not a nationality¹. There is nothing inferior about being part of a different culture, but that different culture does exist and it needs to have a name and symbolica to survive.
¹: Do I need to say "for me" or "in my opinion". I've gotten a lot of people treating me like an idiot because I leave it out from statements like these, but I just assume that's implied. I'm saying it... and it's blatantly false as a fact... of course it's my opinion.
We have flags for every branch of anarchism for this reason. They all have slightly different ways of doing things. Slightly different cultures and customs. While I could try and come up with a flag design that works for this culture while not referencing the only other flag that the culture uses just because a state snatched it up first, using the already established visual shorthand for the culture is easier. And it's also stealing one of the primary symbols the state uses to legitimise itself, the idea that it speaks for the entire culture. It does not. There are also anarchists who are part of this culture, and reject your nation.
And in the end. I don't even care that much about this (yes this is how much effort I but into things I have minor care for). If everyone on this com said that this is a stupid idea I'd probably change my mind, but as it stands you're the only one who has said anything about this. I wouldn't use the flag in any other situation. I like the standard Circled A on black background for most things, but in situations where I need to reference the region of land between the Baltic sea and Peipsi I will use the blue-black-white flag with A Circled A on top and call it estonia, it's the easiest solution.