I'd say more generally, as someone in their early 30s, that my experience says that if you're changing the plan weekly, the problem isn't with the employee, flexible or not.

In general, if the plan is changing every week, that probably means that the work I did last week was mostly pointless. That's a great way to burn someone out.

Good news though! I do contract work, and if you insist on changing the plan every week, you won't need to worry about whether I'm flexible or inflexible. I'll happily fire a client who can't make up their mind and thinks that the best path is to change direction every week.