Not everyone wants nor needs a second full time job worth of time just to play a game.
Pro tip: most games today have 10-15 hours of content padded out with 90 hours of grinding season passes.
I'll take a fun 16 hour experience. That was perfectly fine for the last 30 years, and it's still fine.
You must have never played an armored core game before to think there's no grind. All Armored Core games require grinding, whether that be for money, parts, or skill. In fact I'd go as far as to say it's a central component in the series.
As I pointed out in my last post, 90% of your time in this game for your first playthrough will be spent grinding bosses. I'd estimate that the game can take up to 22 hours for someone who is having trouble but again that time is all on the bosses. Contrary to older Armored Core games, the regular missions are a cake walk and are short. You'll likely be grinding those and replaying them as well given there are hidden items, logs, and you'll just straight up want the money. There's a NG+ mode as well, which is actually just grinding the entire game again for parts.
If you took the grind out of Armored Core, by for example having a meta build or being a skilled player, you'd be left with a 3-4 hour game. Even less if you are skipping the voice logs.
I can definitely appreciate a quality 10-15 hour experience. That said those experiences are typically 10-15 hours of solid content and typically come in at a lower price tag. I've never spent $60 on a game that's 15 hours of content including the grind until AC6. Games like Road 96 are a solid 10-15 hour experience and that game was $20. Hades is a $25 game that takes anywhere from 20 hours to 40 hours depending on if you want the true ending or not. Divinity Original Sin 2 was a $30 game with 80 hours of content. Baldur's Gate 3 is a $60 game with 70 - 120 hours of content, The Witcher 3 is a $60 game with 120+ hours, Dying Light was a $30 game with 50 hours of content, the list could go on forever.
For a AAA $60 - $70 game to only have 16 hours of content, I'd expect extra-ordinarily high production value. AC6 doesn't, most of the game's story is conveyed through text and audio logs. The graphics are only decent and the missions are completely bog standard outside of the bosses, of which is just an imperfect marrying of dark souls and armored core. The soundtrack is a tad above decent but nothing to write home about (there is a single notable song and the rest are pretty generic).