Negative equity is only a bad thing if you plan to sell.
Historical price rises of housing in the Uk for the past 100 years averages out at a smidgen below 1.9%, accounting for inflation.
As long as you can afford to buy and factored in any potential rate rises, don’t sweat it.
Personally I don’t own property, have always rented, because I get far more return on investments, 6 to 9% after inflation and that gives me greater flexibility and accessibility to my money than a house would. As a result, just about to head off on a world tour and as a byproduct of asking my partner to give up work to come with me, I will clear her mortgage Of about £190k and pay her ni annual charge to ensure she doesn’t miss out on state pension. simply won’t make a dent in my money.
Ultimately, a house is just a house, and it’s performance as an investment is not fantastic but more so it’s a psychological security benefit. this is why most FI don’t really advise paying off your mortgage at the earliest opportunity, whether that be overpayments or lumps sums.
But the main point I repeat, negative equity is only an issue, if that’s the point at which you sell.