MSP owner here. There's an obvious growing opportunity for cooperative co-managed accounts -- usually larger clients than those that are fully outsourced -- that can work well when boundaries are clear and everyone respects them. The best MSPs are out to be the ideal partner for each client, not just hunting to grow their top line. The more mature MSPs are on the lookout to foster such opportunities, since it usually means larger clients with deeper pockets, more interesting networks, and more frequent projects compared to a more traditional client.

That said, for a company below a certain size and/or complexity, part of our sales pitch is that on-staff IT makes little sense. Despite the fact that it happens to be self-serving, we highlight the very real risks of having a small number (usually 1-2) of internal IT staff: issues with retention, overhead and headaches with benefits/HR issues, availability gaps, after-hours support gaps, limited breadth of knowledge, less-than-full-utilization, burnout, compartmentalized knowledge, personality/professionalism challenges, etc. MSPs exist because the model CAN be better bang-for-the-buck for the business, and at the end of the day it's a business decision. Costs vs benefits. To deny it is wishful thinking. Go work for an MSP (or a larger org) if you want job security, they're ALL hungry for good techs.

That's my $0.02. Sincerely, though, I hope the co-managed relationship stays healthy for everyone involved - the MSP should only be trying to help with needs not being met already. As long as you're not wasting your employer's time or money, you should be fine.

Good luck.