I agree to the extent that lots of taxes are simply passed through to customers. If you didn't, you wouldn't be in business for long. And yes, many of those taxes apply irrespective of company size.
But certainly not all of them. As is: different locations have different cost structures. They apply to different aspects of your business. Given the amount of goods that are transported throughout the country, it should be clear that capital costs (cost of setting up production facilities), labour costs, material costs, energy costs, insurance costs, labour productivity, production efficiency, spillage, waste and theft etc. ensure that you get different cost structures in different places.
As soon as you have that, you get a mix of suppliers in one market with different cost structures. As a result you get different profit margins and different tax burdens for different suppliers, and with it different returns on capital. Transaction costs, various constraints, and uncertainty about future costs limit how easily businesses can set up shop elsewhere.
Having a mix of suppliers with different cost structures and different tax burdens wouldn't be possible if taxes were just another cost.
Yes, yes, you think that if I made $1 million in profit last year and the government wants 30% of that, that it shouldn't raise prices. You'd be wrong.
No. The situation you describe is where you total all costs your business incurs, decide how much profit you'd like to make and add that too, factor in any profit taxes, and then charge whatever results to your customers.
That only works if your customers want whatever it is you're selling at that price and there's no-one around to compete with you.
In other words: a niche business.
What you're saying is that all taxes are, in the end, paid by society as a whole (including businesses), which is correct. And yes, if society wouldn't be paying taxes, it would quite simply pay for everything taxes are spent on in other ways, so ultimately all taxes are an expense.
But the fact remains that taxes on products weigh more heavily on individual consumers and taxes on profits weigh more heavily on "capital".
This is simply because an increase in profits will certainly not result in an increase in wealth for individuals that make up the "labour" part of society. They are very unevenly distributed and tend to go towards those individuals who contributed the "capital" part of the equation. Contrarywise, a decrease in profits will not *immediately and automatically* lead to a decrease in wages (and wealth for the "labour" part of society). In both cases "entrepreneurship" is in the way.
To the extent you're saying there's no difference between taxes on products and taxes on profits, that's an oversimplification.