only for certain financial and investment reasons (e.g. a net worth of $1MM minus a primary residence is the threshold to be accredited by the SEC - enabling investment in unregistered securities; and financial institutions will set thresholds for certain of their management opportunities based on net worth minus a primary residence). but even in those cases, the calculation is net worth ‘minus’ a primary residence - not a revised definition of net worth.
for the purposes of retirement planning - true net worth needs to be included, especially considering that many retirees change their living situation upon, or at some point after retirement, and any projected equity they have in their home can and should be used to model their options and the optimal timing of those options for decision making purposes.