That sounds like permabull thinking, which I hear more often in the precious metals markets (and crypto, too). So respectfully I'd have to disagree, because there's no asset I can think of that's only worth buying and not selling. If that were strictly true, then half the market for whatever asset we're talking about would consist of fools 100% of the time, i.e., sellers. Plus I can give an excellent example of a bad time to buy land or a house--when you can't afford the mortgage.
Not being a real estate guy myself, I don't know if that generally holds but it doesn't seem to be at the moment. Interest rates are higher than they have been in decades and yet real estate prices are soaring.