For something like circular saw, I think that's much less of an issue. I picture that as something you set up in a spot and use for the duration of the project. So I guess I am surprised it even comes in a battery option.
Didn't need anything better until a few years later and bought a big beefy Milwaukee. I still use the battery powered Ryobi for 80% of stuff though, just due to convenience.
That said, I see things like battery powered table saws and have zero desire to mess with any of that.
For "pro" use on a job site, it's hard to imagine a battery powered table saw having enough power or endurance. I know my plug-in table saw seems to use at least ~1,200 watts @ 120v when cutting something tough like pressure-treated lumber, because it trips the surge protector.
But, I don't know. I see Dewalt has like a 60V powered table saw. With a big enough battery maybe it's enough to be useful for pros.
They're worse for run-time, of course, batteries get drained. Endurance is the issue, but battery powered tools can beat corded tools for power these days.
If you're going to a job site with limited electricity and don't know the exact cut of wood you need before arriving, I can see value. This option isn't for medium/large workloads, and isn't for the guy operating a wood working shop, but might be for a guy that does small jobs away from a shop.
Cable management can also be annoying sometimes when moving around.
I believe you are confusing a handheld circular saw with a miter saw. A miter saw has a base, an arm, and a blade guard; and must be placed on a flat surface/table to use it.
A circular saw is a handheld tool.
https://www.milwaukeetool.com/2736-21HD
https://www.milwaukeetool.com/Products/Power-Tools/Woodworki...
(some of the table saws from other brands are "duel fuel" and can take a battery or a plug, can be nice).
Battery power table saws seem a bit silly until you realize that the construction people often arrive before there's any site power at all, after all, someone has to build the site power connections.