That is because Sunil shifted tracks and began to focus more on his business ventures post 2001.
He was generally lazy and disinterested as a star or actor. He often yawned in interviews and hardly promoted films, never did talk shows, stage shows nor attended award shows. In acting he mainly focused on action and to some extent comedy.
He was doing great during Mohra, Waqt Hamara hai, Border, Gopi Kishen, Rakshak, Vinashak days but wasted opportunities. His last hurrah is 2000 when he did Dhadkan and Hera Pheri.
After that he did films like Yeh tera ghar yeh mera ghar etc but mostly focused on doing films to fund his business ventures. Did not even take his film career as seriously as he did in 90s. He has expensive restaurants in Bombay and prime metropolitan cities now, invested in fitness app, gyms, has his own gym, talent hunt app etc. And is close to BJP as well. His main interests are off screen and he never focused on acting at all after 2000s.
I was surprised to see him in Darbar with Rajinikanth. I did not expect him to return to acting. His main focus is still fitness and action. I felt he was disinterested in Phir Hera Pheri too and was better in the original in terms of acting.
I doubt given how disinterested he is, he can ever bother about acting again.
Akshay changed a lot post 2000 and reinvented himself, cultivated political links, upgraded PR, marketed himself and did versatile roles. He did not just stick to action. His shift to romantic comedies and message films kept him relevant. He is dabbling in historicals also, which Sunil would never.
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