[jw14]

It is absolutely extra work. You have to test every mode of operation. So to support those with JS disabled (about 1.3% of users according to some quick searches) you have to test with JS disabled. Then you have to test again to make sure your JS workflow is stable.

Every business has to make the choice, but unless I was running a pretty large operation, I'd be willing to ignore 1.3% to put my budget into other things.