Virtually any mirrorless camera, or small-sized DSLR, would benefit from having more weight. The heft makes handling more secure and comfortable.
If a grip is required to get a better weight distribution, so be it. Human digits are not possible to downsize anyway. Thus too small a camera makes handling it awkward.
I second Akira's experience regarding battery consumption. All mirrorless devices used by me over the years, whether Olympus, Panasonic, or Sony, have had a voracious appetite for battery power. Again, Sony was the most hungry for power. My late Sony A7 easily went through two batteries per day. The makers should really address these issues instead of ever slimming down their cameras.