> eventually become a millionaire

Why are you discounting real wealth? I am a millionaire. If I spent my millions on buying a modest house in Palo Alto, does that mean I am no longer a millionaire? Have I lost all my wealth just by purchasing a home?

For the purposes of discussing security, counting the price of the residence is not very useful, assuming the discussion participants agree it is an “average” residence that meets minimum expected quality of life standards.

For the purposes of discussing quality of life, if the person values living in the place they are which is higher priced than most others, then the price of the residence could be useful.

I see no reason to include price of house if I were to sell it in my picture of my financial security because I have no desire to live elsewhere (or if I wanted to live somewhere more expensive).

> I am discounting non-liquid assets like the main residence.

That's pretty unusual. Do you consider someone with $1.5M but no house considerably better off than someone with $500k and a $1M house?