The majority are simply going to follow popular opinion regardless of the merits, and developer efficiency is often not that important. I also think the efficiency gains are bigger for smaller and inexperienced teams.
Also, people are getting used to app-like experiences and designers are designing for it. Building an app-like experience is more natural as a Single Page Application, which basically means taking on the modern frontend stack. There are places that push against this, but to do so requires buy-in to the engineering side over product and design. Even then, the engineering side has to be knowledgeable enough to not follow popular opinion and come to the determination that Laravel/Rails/Django is actually the right tool, which isn't always the case.
Also, people are getting used to app-like experiences and designers are designing for it. Building an app-like experience is more natural as a Single Page Application, which basically means taking on the modern frontend stack. There are places that push against this, but to do so requires buy-in to the engineering side over product and design. Even then, the engineering side has to be knowledgeable enough to not follow popular opinion and come to the determination that Laravel/Rails/Django is actually the right tool, which isn't always the case.