Your reply makes the case as to why there is no excuse for it not to be added by now. Storyline is now the industry standard. As you said, it's on every job description, so that means Articulate is making millions annually on this product. From individual licenses to corporate licenses. No excuses that they don't have enough money to hire more programmers to add these types long-requested features. Dark mode for software this day and age is just as standard as Storyline has become.
There is another thread just as old as this one of people requesting native 4K monitor support. Same situation as this one. There's no reason Articulate can give as to why these standard features haven't been added by now. But as you said, there are no other real options, so they have no reason to care.