To think of it from a DRM perspective, all those 32 bit apps you purchased... you will have no access to them because Apple axed 32 bit all together. That's DRM. Your purchases are not yours after all. You are at the mercy of the company who enforces the DRM.
Developers being lazy is not a valid reason. Not everyone has to be like Facebook to routinely update their app with junk lines of code and keep on bloating it till it explodes.
I will have to upgrade my 5 year old CCTV camera system which will cost me $1000 because their remote app is 32bit and very old. It may stop working in iOS 11.
Now I will lose $1000 because of DRM.
It is clear, in this case, that a company charging thousands of dollars for a product w/ an accompanying app, is in extreme dereliction of duty, if they can't perform a simple recompile for their customers.
I would assert that either: they likely will, and you've nothing to worry about, or- they're an EXTREMELY unprofessional company, and next time you drop $1,000 on something- research the company.