Having the extra screen size is plain and simple great and useful.
I also like the fact that I do not recognize any heat issues with my 16" model, means it is quite rare that the fans work at all.
Now carrying around the 16" model is something to be looked at from different perspectives.
Overall it must be clearly said that the laptop is "big and heavy", compared to smaller and lighter models and for example my 14" Dell business laptop.
While I do not see it as a problem
- moving around in the house,
- having it with me when I visit other people, means you normally drive, and then just walk short distances,
- having it with me in a sufficient sized and comfortable backpack
I could imagine that size and weight matters much more when you face a different situation, for example
- you walk or move by bicycle, train or plane a lot and for longer times
- when weight and size limitations come into play (travel by air)
Under such circumstances I can easily imagine that for some people the 16" model is simply too big and heavy and they have reasons to go for a smaller and lighter model.
My "recommendation": If you have the chance to see as well a 14" and a 16" in reality (Apple Shop, other shop that sells these computers), even it´s an "older" M2 or M1 model, go and have a look in reality, take them in your hands and try to get a feeling of your own. All this is very subjective and what may be "heavy and big" for one person is "tiny and light" for another person.
Herbert