"We've got a one in a 100 years pandemic and once in 75 years war and a once in 25 years energy crisis all thrown into the mix together," said SocGen's Juckes. "You’ve got to be 120 years old to have any understanding of this."
"It used to be the case that if you got the direction of euro/dollar right, you had a good chance of getting everything else right, but now it's a bit harder," said Nomura's G10 FX strategist Jordan Rochester.
The differences between currencies are widening.
Last year alone, the euro fell to a 20-year low versus the US dollar, sterling hit its lowest on record and the yen its weakest in 32 years, as the greenback soared broadly on sharp increases in US interest rates to curb inflation that other major central banks lagged.
The Bank of Japan has dashed expectations that a change to its ultra-dovish monetary policy would come early in 2023, sending the Japanese yen down 9% so far this year, on top of a 12% decline in 2022. That has raised the chance of intervention to stem weakness.
More pain is also anticipated for the yuan, trading near seven-month lows, as well as smaller Asian currencies.
Meanwhile the euro is up 2.5% this month against the US dollar and expected to rise further given a hawkish European Central Bank - and sterling has meanwhile risen over 5% so far in 2023, leaving it set for its biggest annual gain since 2017.
Rochester said Nomura forecast the euro moving to US$1.12 over coming months, implying a further 2% gain from US$1.095 now, and expected the yuan to weaken to 7.30 per dollar versus 7.2 now.
The yuan has slid almost 5% so far this year, hurt by a weak economy and a wide interest-rate gap with the United States.
This week Chinese authorities set a stronger than expected trading band for the currency, a sign that Beijing is increasingly uncomfortable with its quickening slide.
Lee Hardman, senior FX strategist at MUFG, said the dollar's rebound against Asian currencies reflected a reversal of the trades put in place late last year with the post lockdown reopening of China's economy, as pessimism about the growth outlook there grew.
Elsewhere the dollar is not performing as well. It's continuing to weaken against some European currencies and also Latin American currencies.
Hardman said that, as market volatility slows compared to recent years, investors were focusing more on carry trades, exploiting the variances in interest rates and monetary cycles between different central banks.
Kit Juckes, head of FX strategy at Societe Generale, said the focus on monetary policy differences was also a result of uncertainties elsewhere.
"What strikes me at the moment about FX markets is they are more short-term interest rate sensitive than I can remember them being.
"Because we are so uncertain about so many things in this most unusual of economic cycles, we're just going to focus on what the next central bank policy move is."
This is not good news for the yen, near seven-month lows against the US dollar and 15-year lows versus the euro, as the Bank of Japan holds fast to its ultra-loose monetary policy.
Of course given what the world has endured in the past few years, it is maybe not surprising that currency markets have gone a little strange.
