People love to hate on #WordPress, but more than 60% of the websites online use it.
Like all things, the system isn't the issue it's how it's run. If you don't stay on top of it and keep your plugins and themes updated then you're creating a vector for hacking.
With these all-in-one services you're not dealing with the vectors, but someone at the service is. They can still drop the ball.
So instead of hating on a software, just use what's best for you and what you need to do. Sound good?