It’s totally understandable when a house is so far “gone” it isn’t useable any longer and remodeling it would be worse than building new. My dad’s place is this way (technically mine, but doubtful sis will ever actually do dad’s estate so I get it). The roof, floors, and foundation are falling in or have significant cracks.
That’s totally different than taking something essentially move in ready and ditching it to build new.
Then there’s everything between the extremes, of course. We’re definitely more toward one end of the extreme than others, I’m sure, but there’s is a point even we would agree on. Broken or non-energy efficient needs replacing, as does better drainage, etc.