How many mobile app did you install last month ? For most people it’s zero. So what makes you to think that your new brand’s app get installed by your customers ?

At the start, your idea is still maturing. You would be doing lot of updated and bug fix every day.

Mobile app store approval become a barrier. You cannot push the changes instantly. It will slow down your development and time to market.

Best approach is to build PWA = Progressive Web App. In most case, that’s more than enough.

PWA works almost exactly like mobile app from your end your point of view. In fact, the end use don’t get to know the difference mostly.

Yes, of course this is few more advantages as well as disadvantages. You should decide based on your business use case and the user behaviors. By the by Odoo only support PWA.