It has to, if you focus on game design over business you either sell a lot less, or go out of business. Neither is desirable for WotC.
TSR kinda did game design over business because their creative side was shielded from the business side, and even the business side had no good idea about the business, resulting in products where every sale is a net loss because the sales price is below the manufacturing cost (nevermind the effort to create it).
While you will probably argue that we got some great products out of that, you cannot argue that it worked out great for TSR
But one can argue--in fact, you just DID argue--that "the business side had no good idea about the business." That seems to be the
significantly greater problem there. TSR ran itself into the ground because of faulty business ideas (and a certain amount of active malfeasance, AIUI)
completely unrelated to game design.
We can also give an example of the reverse: a company that ruthlessly prioritized business above all else, which profited only in the
short term, only to suffer for it long-term. Walmart. They took the stance that
absolutely all costs should be reduced as much as possible: everything from demanding lower prices from their vendors (which killed Rubbermaid as an American business; they couldn't afford to sell at the prices Walmart demanded without resorting to overseas labor), to exploitation of transportation workers, to dropping employee compensation and benefits through the floor. And for a while, things were great! They made massive profits and expanded all over the country.
Unfortunately, this absolutely cutthroat attitude, plus their reputation as a
terrible place to work, bit them in the butt hard starting about a decade ago. Their employees didn't care about keeping a job everyone knew was a last-ditch "I had to find work
somewhere" job, so stores weren't getting cleaned, shelves weren't getting stocked, customers weren't getting prompt and friendly support, etc. Customer satisfaction dropped into the sub-20% range at many stores. And at the broader level, communities
revolted against the possibility of Walmart moving into their area; in my own city (not exactly a "big" city, but not a small one either), there was an active campaign to deny Walmart the permits they would need in order to build their shopping centers. It took years of effort, millions of dollars, and they ended up getting only a fraction of what they'd hoped for.
It is just as foolish to prioritize business
absolutely exclusively as it is to prioritize product
absolutely exclusively. Thus, we are left not with a black and white "well obviously you dump design entirely and do whatever makes money
right now" position, but one that requires nuance and careful thought. And, importantly, one that can argue that
maybe, just maybe, WotC made the wrong call on a few things--not everything, as I'm sure you'll be eager to assume I'm saying, but on
some things--and would have done better with a different arrangement.