Assisted living does not come cheap.
Also, the grim reality is that you have to live long enough to need assisted living. A life expectancy of 78 sounds good on paper, but by the time you get to your late 60s and early 70s people in your age bracket are dropping pretty quickly.
They may try to put it off as long as possible, but it will catch up to them. And then it does not take long for the costs to consume their would-be estate.
And the irony is that it's the system their generation built for their parents.
For example in the US a male has a life expectancy of 76.22 (https://www.ssa.gov/oact/STATS/table4c6.html), but a 70 year old male has a life expectancy of 84.59 years.
But that doesn't take away from your main point about people wanting to avoid that situation.