Doesn’t matter that much for Blu-rays since they’re non-organic anyway. It mattered more for DVDs since they use organic dyes, but I couldn’t find any M-Disc DVDs in Poland.

Which brand do you use? Not a single Verbatim has ever failed me, neither DVD nor Blu-ray. I also use a full-size burner with 12V SATA-USB adapter, not those stupid “slim” ones.

If I wanted to watch movies destroyed by compression, I’d go streaming. Blu-ray allows for way less compression. There’s a reason Blu-ray remuxes aren’t DVD-sized. Heck, some movies don’t even fit on a single layer Blu-ray! Do you want to compress that to 4.7 GB? And that’s only main title, without extras!