So yes, they switched on that, but it's really not hard to see why. I wouldn't want to use it for personal transactions. (In Germany, we mostly use bank wire transfers for that.)
This is the heart of the issue. Based on anecdotal evidence, there is little to no transparency in the freezing/unfreezing of accounts. This makes PayPal a cash flow risk to any business that relies on it for funding. I wouldn't be comfortable if my employees' pay depended on cash flow coming in from PayPal unless I had other dependable sources of emergency cash flow that could be tapped for indefinite periods of time.
It's good that your account was unfrozen after a few days, but what if you needed the money to pay your employees, so that they could pay their rents? Getting lucky with a short freeze is not a business strategy.
Paypal wasn't really designed to handle one off personal payments, it was designed to let small (and large) businesses accept payments, internationally and fraud free. This is ridiculously difficult (how many of you have ever written software that integrates with a bank? ugh.) PayPal does this exceptionally well and because of that many huge businesses are built on its back.
The reality is, in most of the situations that people complain about freezing their money, without paypal their entire project would've been a no-go anyway.
I do feel for people who legitimately have their accounts wrongly frozen (I am one of them, though mine was unfrozen after a few days), but you have to understand how small a percentage of people that is, and that you can't have a system without failure. Again, paypal's failure rate, when you consider what they actually do, is astoundingly low.
Edit: Just for absolute clarity - I work for Etsy and have zero affiliation with the blog from the OP, and it has zero affiliation with Etsy. Also these are my opinions not my employers etc.