Hi Steve,
Yeah I had mine for about 10 months and in that last month or so, I noticed the battery life (which wasn't all that great to begin with, though everything else was fine) was getting noticeably shorter a lot sooner than I expected it to, which is why I ended up getting the LG V30.
I think flowerman is asking though if it sounds any better than before Oreo was installed? My answer to that would be yes, but not based on direct experience. I talked to someone on here about the Sony Xperia XZ Premium phone, and he told me that after the phone got the Oreo upgrade, he noticed that it sounded considerably louder than before. He also noticed that Oreo gave that phone a 30% boost in battery life, and it was already pretty decent to begin with. So Oreo ftw!! Though Steve, if you're not noticing any of these, that would be odd.
That IS awesome that Oreo also gives ppl both AptX HD and LDAC. Both are on the cutting edge of the best wireless sound technologies available. IF I were to switch over to wireless, I would want both options as well. Or at least AptX HD, as you need a pair of Sony headphones or speakers to get the FULL benefit of its use.
I did consider the LG V30 too, but after I got the 10 I realised that I prefer to keep the phone for communication and Internet duties and use a separate DAP for music, so I didn't see the point of getting another phone with high-end audio capabilities.
I can't be sure if the HTC 10 is louder after the Android upgrade but it isn't quieter. It drives my Beyer T5p Gen 2 very well after the upgrade, as it did before.
I do have the Sony WH-1000XM2 and the LDAC connection seems to work very well, but I haven't taken the Sony/HTC pairing out on the road yet so we shall see.