Historically, companies really don't know what they are doing, especially on issues like this. Glue work often encompasses tasks viewed as feminine and its de-emphasis hurts women's careers (and men who happen to focus in glue work too): https://medium.com/@granellacamila/a-few-months-ago-i-discov...
> In a study published by the American Economy Review, the researchers discovered that women volunteered more than men for tasks considered glue work, hence, less promotable tasks in general. However, the researchers have also found that men waited longer to volunteer for tasks when there were women on the team. Furthermore, women were more volunteered by managers or colleagues than men. These kinds of tasks have a direct impact on women’s career development through time.
It took two world wars for some companies to get over their biases and actually let women join the workforce. It's no surprise then that companies would continue to devalue glue work, even if it hurts their bottom line.