Oh, thanks for this. Although I have a relatively high-end headphone, I really can't tell the difference between FLAC and AAC.
True! As a matter of fact, no one can. In terms of reconstruction of the original sound, only a digital comparision can verify the difference between a lossy track, and a lossless one. Human's ears are incapable of the discrimination, even with the highest-end equipment (headphones, speakers, etc.).
Unfortunately, this has become a trend for most releasers to go with the FLAC, which eats up resources (bandwidth and storage for both the distributors and users).
Personally, I don't have the time, and of course raw materials, to do any encoding, but as the Cman kindly provided here, try and re-encode everything I have in FLAC, into AAC (and keep only the Japanese audio except for very few animes).
I am an audiophile and still find it unreasonable... However, as I am actually downloading other people's work, I don't complain on their method, and simply look for the best possible option