If the market the house is in is conducive to STR, then it can be worth it, but in some circumstances and in some markets I think LTR still works better, but it is clear STR is taking a foothold as an option in the Investor mindset and we see that in the market and I think a pretty clear prediction is that STR will take a bigger and bigger share of the investment strategies of investors.

There are just more stories and more issues I see in many circumstances.   

@Justin Brin Yes, you can elect to aggregate your rental properties for Qualified Business Income (QBI) purposes, but once you do, you must continue to aggregate those same properties in future years unless there is a significant change in circumstances (such as disposing of a property).

Most Heloc's have clauses in the loan agreement regarding financial conditions, undue/unauthorized risk, change in circumstances, etc.

The Veteran can take full advantage of their VA loan by selling quickly and at a premium and then go use it again for the next property (in some circumstances). 

Turning a large room into a bedroom and closet can add value depending on circumstances.

But the real secret to making money in real estate is finding the right properties at the right price—and that's where off-market deals come in.Off-market properties typically cost less than those listed on the MLS because sellers are often motivated by reasons other than price, like financial distress or personal circumstances.

Different times, different place, different circumstances but did good on each flip at the time.

Given these circumstances, do you think an LLC is the best approach, or is there another way to add me to the title without affecting property taxes while ensuring I become an owner?

You'd want to enlist the help of a CPA/EA who can help you plan it out since there's a lot more than the standard 121 exclusion involved if you go this route.Regardless of your path forward, I encourage you to reach out to a tax professional who can assist and advise with your specific circumstance in order to make it more personalized to you.