Yes, it's been increasing for a while now; driven in part by the fact many companies and industries now consist of technology driven work. Companies with an international presence or which have outsourced some of their work to foreign workers have had to build the infrastructure to accommodate this work style. Then, of course, the move to cloud computing makes things even easier. My employer is a large international company, so I've seen these things change over the years. Most of the software developers work out of India and Eastern Europe, and the need for travel by executives has pushed the need to have access to their software.
In my experience, productivity rising isn't surprising. I've always found the idea that working remotely somehow meant people would just slack off, but I haven't found that to be the case even before the pandemic. It's all about how people are managed and the implementation of tools to track productivity so one can hold people accountable. For me, the challenge of working from home is knowing when to call it a day. When your home is your office, there's a tendency to check emails, spend an hour or two on a project I'm working on etc. well beyond the hours for which I'm compensated; you have to build discipline on managing your time.
The real benefit is having flexibility and more time with your family (if you have one). The tasks you normally found difficult to do because you didn't have the time, are now possible. The two hours a day I don't spend commuting are there for me to exercise and spend with my wife and daughter. Local errands can be scheduled during lunch etc. I've found these conveniences an improvement to my quality of life, and has not affected my productivity in the slightest. My day is spent in meetings and when I'm not in those, I'm working on reaching my deadlines. I think how some view work is still based on the old factory mentality where people have to have supervisors watching their every move. For those working remotely, we're professionals being compensated well to deliver results, so our reputations and career growth are tied to our productivity.