I disagree wholeheartedly.
The big problem with every single writer nowadays is a complete and total inability to stick the ending.
I'm really trying very hard to come up with a TV show, book or movie that I thought really stuck the ending in the last 10 years (I'm being generous--in reality I'd even say 30 years). A whole host of the fan theories are WAY better than what practically all current writers crap out.
If I'm being charitable, I'll describe the problem as writers lack varied life experience. If I'm being uncharitable, it's that most writers are just not very intelligent.
That's so very not the case that the person complaining either isn't looking very hard, or else have such narrow taste that they're excluding most works without even considering them.
I just want to add: what's an example of something you think is a really good ending, from any book or show or movie from any time?
That was fine a decade or two ago when a person might guess the ending to a TV show and blurt it out to their partner on the couch. However, now that small group that guesses the plot correctly will share their predictions on the relevant subreddit which will be picked up by blogs and suddenly everyone knows where you were going.
When that happens, the creatives are faced with the choice to change that ending or just deal with the twists and turns getting spoiled. Westworld is a memorable example of the creators changing the show because fans guessed what was happening next. The end result was that the show didn't make any sense because it prioritized unpredictability over all else and eventually the world and characters didn't make any sense anymore.