Arborists! I’d love to learn more about the sudden fall of this huge oak tree

Last night a huge oak suddenly fell in my yard (it sounded like a freight train!). I’d love some professional opinions on what may have caused a very established tree to fall like this. We’re in the central coast of California. I don’t have many pictures of it from before, but it seemed well balanced and didn’t show signs of decay from the outside. Low hanging branches had been pruned maybe in the last couple years? The main issues I could think of were recent drainage problems in this yard (but water wasn’t really collecting in this area, it is uphill), and it had a TON of holes bored into it to store acorns by woodpeckers, so maybe it was just diseased or infested already? It looks very rotted in the trunk. Maybe it’s just the cycle of life, but we will really miss it.