You can make fiat trading EMA but you'll probably have less and less coins with time.
IIRC, Goombo provided backtesting on his daily EMA trading system and it outperformed "buy and hold" (by what margin I do not recall). This suggests that, if fiat gains are reinvested, that you will have more and more coins with time.
I'm on my phone now so please tell me I don't have to dig up the post where Goomboo explains why even though his strategy can't match buy and hold it is preferable for those who want to minimize the risk of fiat loss.
TLDR: YDRC (you don't remember correctly)