First of all Yuva is not a remake. The film was made simultaneously in Tamil and Hindi with different cast. And yee many Bollywood remakes fail despite strong story lines because of the following reasons-
Wrong casting- some very good films lose because of wrong casting. Many people from film families use south remakes as safe bets to launch their incompetent children into the industry leading to an utter loss of quality. We had a National award winning film Helen remade into Mili which proved to be a massive disaster. Similarly another very good South film Kolamaavu Kokila was remade as Good Luck Jerry again with Jahnvi Kapoor which got directly streamed on OTT. Similarly, we got remake of Ghilli as Tevar with Arjun Kapoor, Thadam was remade as Gumrah with Aditya Roy Kapoor. Recently Premalu was remade as Prem Keetanu where an uber rich Veer Pahariya tried to pass off as a young man while looking like this. Love Today was remade as Loveyapa, all these movies had potential but wrong casting failed it. Another thing is that perhaps the actor lack the aura to carry off such a film like we see in the context of Pavan Kalyan's Badri which was a major hit but the film was remade in Hindi with Tushar Kappor, Amrita Arora and Gracey Singh in the lead.
Wrong Budget- some regional films are generally made on a limited budget and they have the sensibility of a small film. But when they become major hits they are remade on a massive budget which ruins the spirit of the film. Driving License was a Malayalam film made on a small budget and immensely successful. They roped in Akshay Kumar and Emran Hashmi in the remake and did so many songs ballooning the budget to over 150 crores which is too much for a simple drama film. The film became a massive flop earning less than 20 crores. Same thing happened with Sorarai Potturu which was remade as Sarfira with a budget of around 100 crores and the film flopped badly.
Outdated film- Films need to be remade before they become outdated. Some makers try to remake films that are bit outdated for today's time. The 2005 film Chhatrapati was remade in 2023 with Belamkonda Shrinivas Rao and Nusrat Bharucha, that too on a budget of 50 crores. The film ended up earning less than 5 crores. Similarly Sajid Khan ended up remaking 1983 film Himmatwala in 2013 which in itself was a remake of Telugu film but the difference between the original Telugu and 1983 Himmat wala was less than one year but the film was not worthy of a remake in 2013 and that too on a 80 crores budget. Result was a colossal failure. But the worst choice was Govinda trying to make a comeback by remaking a 1982 Rajnikanth film Netrakan as Rangeela Raja which turned out to be so offensive and tone deaf that it was washout at arrival.
OTT and over saturation- in today's time South films are vastly seen and easily available on OTT and Youtube. So why would anyone want to watch the remake? So Jersey starring Shahid Kapoor failed badly despite coming after Kabir Singh and despite being a decent remake, simply because the original was easily available online. Soorarai Potturu was released in Hindi as Udaan so there was no need of a hindi remake separately which is why Sarfira failed. Recently Haiwaan also failed very badly. Even the remake of a Blockbuster film Ala Vaikunthapuramaloo called Shahzada failed badly because the original was available and the remake didn't add anything new to the existing film.