re: Buy, Borrow, Die feasability?

What I find interesting about all of this, is that while this is one of the en vogue reddit talking points for their hatred of uber wealthy people, I actually see a lot of viability for your middle/upper class people that may have a decent taxable brokerage account but also aren't in any risk of ever hitting any estate tax issues. Can be a very good way to avoid the capital gains tax on that account to help supplement income or whatever they may need.

The uber wealthy would much rather pay the capital gains tax and pay these LOC's off prior to death than have the values go into their taxable estate and while it does happen where they die with them, I don't think that is actually the norm as some would have you believe. If the company stock or whatever they are using is actually valuable, they are probably planning to pass it on through a trust anyways as it is going to be tied to ownership of a business and not something they want to just be liquidated to take care of outstanding debts by the estate.

I'd have to sell appreciated assets and pay LTCG to reallocate into cash equivalents.
Cash equivalents would pay interest/dividends further increasing income taxes and reducing my already narrow space in 12% bracket for most efficient Roth conversions.
Approaching 50 so we have a long term investing horizon and pension covers primary expenses & current lifestyle so we can take on risk and wait out market decline.
Rate risk is a concern but was supposedly taken into account in the scenario I ran through AI.
(Maybe I could mitigate by paying interest as it accrues if rate exceeds 6-7%)

Still thinking through this strategy and will require much more analysis before I act. Please keep asking ? and poking holes really helps to look at it from every angle.