For copper water lines, I wouldn't look to replace buried lines until they actually fail for the same reasons and again if doing work on the interior I will often replace with PEX as Im getting other work done.

I think the worst are the ones that will say they can do something for you or bring something to you then do nothing at all/fail to follow up or stay in touch (lack systems, organizational skills, and actual work to produce).

The second one is not when you failed to install security cameras.You could go after the PM and contractor for failing to install the security system.

If not (or if they fail to respond), I send them a 30 day notice to quit when I'm 30 days out from the end of the lease - in accordance with the Michigan eviction process.

Ninety percent of agents fail or quit in the first couple of years because they think the job is easy or they can do it as a side hustle, but why would any client want to work with a part-timer?

What most fail to do (which you haven't), is underwrite all the other expenses like property management, landscaping, repairs and maintenance, capital expenditures, etc.

The risk is a failed inspection blocks Section 8 payments, so I could miss a month's payment if I don't get the issues resolved by the end of the month.

This means you  will likely fail unless you scale to the point where you fall under the category of those who can benefit from operational efficiencies noted above (and very few reach this stage). 

Several posts I have made I have failed to include “check zoning”, but the reader must do their due diligence.  

Most cash flow or door chasers fail to understand this and that's what leads to bad investment decisions.