Saia's 401k plan limits the number of funds available for purchase. Most are junk but the key ones, for me, are the FRGXX, FBGKX, and FXAIX. The FRGXX is where I park cash. The fund is stable, pays a little interest, and it doesn't trade in stocks. I've never lost a penny in that fund. The FBGKX and the FXAIX funds are reliable, plus there is a loophole, that allows you to withdraw funds, without setting off the round trip alarm. The market takes an 800 point plunge and I add cash to FBGKX and FXAIX plus open new positions, in a few more. The MKT rebounds, it always rebounds to some extent, and I start utilizing that loophole and withdrawing funds, with whatever profit, that Fidelity calculated I had earned on the bounce. However, the bulk of my account has always been , in cash, in the fund that pays interest. It may not be the educated way to manage my account but I know that MKT downturns will not kill me either. It takes a while to build up a nice nest egg but I've been doing it over a period of a couple of decades.
To answer your question,It's only a loss, if you sell, and I never sell. The biggest gain is how fast you can remove the cash plus profit to a non risk FRGXX account.