I can't speak for the method taught by S. N. Goenka but practise must always be balanced. It is not skilful to suppress or push down the mind (into the body) in such as way that suppresses or traps stress within the body (rather than allows stress to break up & rise up out of the body).
To release stress out of the body requires some degree of 'openness' of mind.
Focusing on the entire body as a whole sounds more closely aligned to the Buddha's teachings about letting go. As long as the mind is alert & quiet (i.e., not too lax in terms of letting distractions arise), focusing on the entire body as a whole is good method.
Below is a famous scripture about too much & too little effort.
Sona, over-aroused persistence leads to restlessness, overly slack
persistence leads to laziness. Thus you should determine the right
pitch for your persistence, attune the pitch of the [five] faculties
[to that], and there pick up your theme.