well the whole AACS problem especially with the ability of nuking old keys and stuff which is pretty much the only reason why people keep buying new pdvd versions. also we get unskippable ads, language settings we cannot change ourselves, screenshot prohibition, the inability to make backups, etc etc.
while CSS (the DVD copyprotection) was heavily burdened by the US export crypto laws, it's effectiveness can certainly be doubted (the practical effectiveness is zero since half an eternity but in law it's usally a bit different but when CSS has been cracked since about 17 years [decss released 1997] and VLC can literally bruteforce the discs open instantly with just 5 bytes which are already stored on the disc itself and not even needing one single player key, because the algo is weak, outdated and full of flaws and even back in 1997 with a 366 MHz celeron it took only 17 hours to crack a CSS Player key. Later ALL CSS player keys were released, making a revocation impractical [would you like to explain to every DVD player owner that they have to buy new DVD players just because someone hack the keys] especially since the new player keys could be found out just as quickly or even quicker due to the fact of the quick rising of computation power) and in Finland the legal effectiveness has been officially dropped already back in 2007, 9 whole years ago, making it at least there completely legal to circumvent that and any annoyances that come along. while AACS is also pretty much down due to AnyDVD (others already mentioned it so I dont think it's against the rules to name it) but since it uses modern crypto (AES).
and with AACS 2.0 they make it even possible to enforce an online connection just for watching the disc.
http://www.myce.com/news/sony-hack-reveals-aacs-2-0-ultra-hd-blu-ray-copy-protection-details-75833/
honestly I would have no problem for example after getting my bas version of PDVD that I for example could pay like 10€ per year for AACS updates, I dont care about new features but powerDVD 10oem wont let me play new discs and the drive which got that PDVD version is iirc less than 2 years old, stupid, right?
but why do you suggest that VLC plays "most" blurays, especially without relying on third party software that I wont mention for now bwcause depending on the place where people live it may be illegal.