Full version upgrades to a Windows PC used to be rare: Most people only had to deal with an upgrade once every three to five years, and then typically as part of the process of buying a new PC.
Now, in the “Windows as a service” era, you can expect a feature update (essentially a full version upgrade) roughly every six months. And although you can skip a feature update or even two, you can’t wait longer than about 18 months.
