Well actually it’s your problem and one that you engineered (not to put too fine a point on it) 
. Surely you want to accommodate as many people as you can (especially when you are selling something) rather than alienating them? That doesn’t sound like a good business model from any standpoint.
I never have my browser window maximised and often have my open applications taking up a quarter of the screen as that is the way I like to work. I expect sites to fit in with me and not the other way around. If sites don’t adapt properly then I just go to a better site instead. I looked up metal storage containers on Google and the first site that came up was responsive and adapted to my browser nicely.
Of course you are free to code how you think best and what best fits your design intentions but it is always worth listening to the advice you have received on these forums as it comes from good reliable sources.
Web design is full of compromises one way or another as not all things are possible or feasible but that doesn’t prohibit creativity and a good designer will still create a good accessible design. It’s all about being professional and doing the best job for yourself, your client and your customers. By all means bend the rules a bit but your basics must be sound.
It’s not always about you. 
Where’s @Stomme_poes when you need her