Could you go into details about why you think this?

I haven't used PowerPoint in years as I think my needs are pretty simple but I wonder what I'm missing.

I can see that the Microsoft ecosystem gives control on who can view files and provides collaboration and control. Both of which would be useful in the corporate world.

Is there's somethnig other than that or is it just ease of use?

For the most part I see people using MS Office tools because it's what they are familar with. They're familar with it because it's the only thing their IT department will allow them to use.