All equity means no payments due to the bank so there can't be any late payments triggering a foreclosure sale putting downward pressure on home prices.
But overall, how many homes are paid off and how many have hefty mortgage payments because housing prices are 3-4x today versus what they were pre-2008? And it's not just larger mortgage payments that factor into this because the cost of most everything has gone up (property taxes, insurance, maintenance, food, etc) putting pressure on what people can realistically afford to pay for a home.
It's not a bad thing to have more realistic values. The bad thing happens when a market gets too hot to be sustainable and people get caught in the transition to something sustainable.