I figured a lot of this advice was time sensitive to an extent.

Lots of foot traffic in and out so keep in mind neighbors are sensitive and you'll need to be kept aware of that.

If there's a hole, it may be a red flag.b) sensitivity analysis: I examine all the assumptions, and make sure I can live with the worst case scenarios.c) "Stall and see": if they are getting money over multiple years, and there is no penalty for investing later, I would usually wait so I get some real performance data, versus having to look at theoretical pro forma information.d) Recession stress test: I will not invest in anything, until I subject it to recession level stress and see if I can live with the result.

Not sure in what area you are considering investing, but all of these three are investor sensitive and base their practices on investors.  

There's a high risk that you might find the tenant base in developing neighborhoods is harder on your properties and more sensitive to changes in the economy and has a lower rate of making on-time payments.

personally the whole "double closing" that they do is pretty lame ... it eats margin on the deal and they are not doing anything but creating an environment that makes you feel like everything is super time sensitive and create a sense of urgency.  

Bridge loans can be an excellent solution for real estate investors who need quick financing to take advantage of time-sensitive opportunities or to overcome financing challenges.

Depends on your current interest rate and how sensitive you are to an increase.You also haven't told us anything about your loan and equity of your primary.Typically, you will get better rates on your primary.You can either do HELOC or cashout refinance.A construction loan is not recommended as they are more expensive and best for low equity situations.

Some folks are just super sensitive.

This is a culturally sensitive topic for Kauai because he is using a long-term rental as a vacation rental.