That's honestly fair. Times do, indeed, change.
Older episodes can easily be written off as the violent-humor cartoons of the day were known for. Newer episodes don't have an excuse to making fun of child abuse.
That said, I do wonder if the satirical nature of the Simpsons was supposed to be evident in Homer strangling Bart. It always struck me as something he just 'did.' Not really funny or unfunny, just a facet of the show. It's possible the writers were originally trying to highlight how a dad like Homer might physically discipline his children out of rage while Marge just lets it happen.
Remember, the Simpsons are supposed to be satire.
Yikes.
Building everything from scratch is one thing.
Maintaining it is completely different.