I believe that fostering long-term, unfettered research is an important element for revolutionary work, though I don’t believe it’s the only way for revolutionary work to happen. However, it’s difficult for most companies to consistently fund this work for an extended period of time. Bell Labs and Xerox PARC in their heydays were special, and I struggle to think of any modern-day equivalents in industry.
While antitrust actions might temporarily disrupt a company's innovation, they ultimately foster a healthier market by encouraging competition, which drives more diverse and widespread innovation across the industry. Breaking monopolies often unleashes creativity and technological advancement by empowering smaller players and preventing market stagnation.
If the government steps in they would have to break them all up and expect to make entering those sections possible. At the moment it’s nearly impossible.