But Rafale in isolation has already proven its not up to the task. The Su-57 cannot possibly do worse- at the minimum it has stealth and much larger and more numerous (albeit most likely not more advanced) sensors. Being a Russian weapon, Su-57 can be more easily integrated with India's other air and ground based platforms, enabling India to embark on the first steps of transitioning from a platform centric doctrine to a systems centric doctrine focusing on information driven network centric warfare. Su-57 will likely be less expensive than Rafale as well. Unlike France, Russia is also far more open to transfer of technology and local assembly/production.
I agree that su-57 is probably now the best choice around.
My reservations are 3:
1, su-57, shall it be introduced, will be a vivid symbol of
personified management mistakes, going veeery high up. Rafale was su-57s replacement in procurement. It's a basic political question,
Who replaced better jet with a worse one, for some french benefits. And this is a big,
big political issue both for the government(15 billion), in the air force and even in the navy. Which is now in a terrible spotlight, too.
2, maybe India can tank through public pressure. Like, yes, Rafale lost its national champion status, and it's certainly too expensive for what it is, but saying it's now ineffective is arguably a step too far. Jet itself is still the same as the day before the strike.
3, as you said, su-57 is in many ways is a better Rafale on steroids. But one of the reasons rafale failure was so loud is this very secondary system-rich concept (paid a lot of money and internal volume on systems that failed to save it). Su-57 in many ways is a super rafale, 50% larger and better in every possible regard. It's unlike other 5th generation aircraft, that bet much deeper on stealth. It's ironically even the smallest nose within it's generation(twice better than rafale, but still - much like rafale radar is smaller than j-10, n036 is smaller than an/apg-81 of a smaller, single engined F-35).
And that's the point - su-57 itself may have received a similar conceptual hit.
All those arrays in different bands, redundant self-defense systems make best case for Russia itself, trying to protect and augment it's defenses against OTAN in the west.
For countries with a simpler requirement, it's 50% cost of the plane spent on equipment not equally contributing to the main task of the fighter.
Instead, maybe just better stealth geometry(which is always on, and which, one achieved, doesn't cost much money)?
It's even for Russia itself - su-57 is twice as expensive as Su-35, 3x the price of su-30sm. If you throw out inessential see stuff and just follow J-20/F-35/J-35 logic(which is T-75), maybe you can get similar or even stronger(geometry!) plane for half the price?
J-10 after all didn't
just bested Rafale, it isn't painful (fighters win and lose). It bested it in a way where price difference between two deals fits entire Pak AEW fleet.