What has bothered me most in this thread is the statement,
'Live every day as if it were your last.'

If I knew it were my last, I might take chances that
I would take at no other time because in that situation
there would be no long-term consequences. Living this
way day-to-day puts outcomes on the flip of a coin.
It puts all risk taking at a 50% chance of success.
No one can come up with heads 10 times in a row.
To live life this way means a roman candle kind of
life -- a few big thrills but certainly not many of
them.

Any wisdom contained in the quoted statement is probably
related to using your last day to attending to your
affairs and setting things straight. I wouldn't foreclose
on all those future thrills for this one big one that
also might come up tails.

That's fatalism at its worst.