CAPE10 and Market Cap to GDP may not be "timing" indicators, but they are absolutely indicators of valuation. And both clearly show this market has been over-valued by at least 50% for quite some time now. Will that continue? Possibly. Possibly not. But at some point, perhaps soon, valuations will revert to more historical averages. If anyone just wants to "ride that out", more power to ya. But I personally would prefer to pay attention to the clear signs that help one avoid the huge downdrafts and long climbs back up. And there are plenty of very smart people (Stephanie Pomboy is one - very highly respected macro analyst) who agree. Last I saw, Steph is roughly "zero" in US stocks aside from a few miners and energy companies. She'll move back in when valuations are more reasonable. Good strategy, IMHO, and I wish I had not gotten greedy in late 21 and took more profits than I did.
Re: the Fed - most major US banks (Morgan Stanley, JPMC, etc) are forecasting at least 4 and as many as 7 hikes this year. I suspect the first hike (in March) will be .25, not .5 regardless of recent public statements by Bullard. That said, I do think it's entirely possible we will end the year at least at 1% and possibly 2%. What do you think will happen to stocks in that scenario? If you're not taking action in a Fed hike cycle like that, the odds are high you're going to be on a rollercoaster headed down quickly. If you're good with that, that's fine - but at this point in my life in ER, I'm not good with that and will take action to avoid the clear freight trains headed straight for us whenever it's possible to do so and the signs are all flashing warnings bright neon red. And based on the recent sell-off, a lot of other people are doing precisely the same thing for the same reasons.
Yes, the market is largely unknowable. But as I've said, there are very clear signs on valuation and Fed action that many experienced investors recognize. A good number of them are acting on those clear signs. If anyone wants to ride the rollercoaster down and (hopefully..see Japan) back up over what could be many years, that's an individual decision. However, the signs have clearly been there for some time now. Could the bull continue to run for a bit? Sure. But at some point likely soon, things are going to revert to mean. In that light, risk management and not just blind buy and hold is prudent, IMHO.