How do you calculate the maximum watts for the main studio flash strobe?

Some people say: maximum watts for the studio flash strobe depends on what one plans to shoot.

Other people say, it doesn’worth to have very powerful flash strobe if the studio is small.

What would you say? And why?

Studio about 60qm, main flash strobes could be maximum 400, 600, 750, 1000, 1200 and 1500w. Fashion and beauty shootings.