What I would ideally like to see is a new 4.5 or 4.6 branch created from current master that is consider locked in with only stability and bug fixes. I'm sure Mark has a good reason why he hasn't done that yet but we seem to be at a crossroads where 4.4 is too outdated.
I recently moved to 4.5, and I like it. Still a couple things they're working on in its early stages, but I think it's important to consider Mark has quite a few deployments of FusionPBX and code changes that broke things would break some of those deployments; many of which are likely loyal customers.
The next thing to note is you don't necessarily have to update, in fact, I wouldn't. Hourly based changes are not the types of updates I want to deal with, more weekly or monthly updates are the type I'm going to be pushing.
To add to this discussion though, I wonder if there are recommended periods of time when FuxionPBX users should consider updating. Windows has patch Tuesday as an example, and I've always used that as a rule of thumb to roll out updates a couple days later to learn from issues that other people may have had from the updates.