There's a lot to unpack here.
First, are you talking about net worth or value of investments? This makes a huge difference, because for someone in an exploding property value area, buying a very expensive home may shoot their NW up rapidly, but if they plan to live there in their retirement, then the increase in property value could seriously hurt them in terms of property/local taxes and cost of living in the area, which could actually delay someone's ability to FIRE.
If it's someone who plans to downsize and relocate to an LCOL area, then being heavily weighted in home equity could dramatically accelerate FIRE.
Because housing is still money being dumped into an asset, it's not as black and white as "if you spend more on housing, you will have to retire later".
Also, more expensive houses aren't necessarily larger and have more maintenance costs. Where I live, some of the most expensive real estate is 2 or 3 bedroom apartments in desirable locations. Giant, sprawling suburban properties are significantly cheaper and come with enormous maintenance costs. So again, it can be apples and oranges. Two people could be spending the exact same amount in terms of housing and transportation costs, but the one living downtown is putting more of that cost into equity while the suburbanite is losing more money because a larger proportion is on expenses like heating, snow removal, and commuting.