I have repeated assurances by all bears that all miners immediately sell all of their bitcoins for fiat.
Don't forget the merchants too despite Bitpay saying most coins are immediately sold OTC to a network of buyers.
Ignore that. Every single merchant transaction is a Little Death.
It's only a "little death" if you use that spending opportunity to cash out of BTC. If you replace most if not all of your bitcoins as you spend them or some convenient time thereafter, in order that you continue to retain a sizeable stash of BTC, then the odds are better that your spending has caused some rippling effect (even if a majority is converted to fiat) and you have accomplished some positive developments in the bitcoin space.. rather than merely assisted in a cashing out.
Really there is NO problem with doing both... cashing out and spending and replacing... each person needs to assess circumstances to decide the extent to which s/he is going to engage in each activity.