France is useful if you do not want to be reliant too much on the US and makes excellent equipment, only issue os the rest of the world is catching up faster then France and innovate.
South Korea, Turkey and China already make SSKs in comparable class
Turkey, South Korea and Italy already taking a lot of France's traditional naval markets
Rafale is a great success by any judgment but 5th Gen is big question mark. Looks like France will be left behind by Turkey, China, South Korea, US and even India.
South Korea and Turkey are making German U212 and U214 under license and TOT, Its a similar arrangement to what we have with French Naval Group for Scorepene Subs which now have 60% indian content .
As far as China is concerned , it will be foolish to assume that their technology now matches the French and German Submarine Tech.
As far as India is concerned , I am not in favor of buying U214 or S80 , reasons are as follows ,
S80 is an untested sub design with only 1 example in operation, which was inducted in Spanish navy in 2022.
U214/212 while being a tried and tested design with 17 Subs in service across Germany, South Korea , Turkey and Israel and having a 20 year at sea experience . It however suffers from the German Tendency to throw a hissy fit if you do anything which doesnt match up with their foreign objectives .
Indian Navy had this experience while buying U209 in the 1990s , where Germany blocked the sale of last 2 subs due to our nuke tests and we ended up with 4 u209 subs instead of 6. Germany also held up the Mid life upgrade of these subs for 12 years and they only provided the upgrade package when they were announced as one of the 2 contenders for 6 P75I ssk subs.
In my opinion, India should stick with the Scorpene class subs . They are a proven design and are also equally successful in the export market . We already have the TOT and are buying 9 of them , with the last one set to be delivered in 2030. We should order 6 additional scorpenes and be done with it. France is also helping us to Integrate Indian made AIP with these Subs and have offered the SCALP cruise missiles as part of the package for last 3 scorpene subs . These missiles are far more capable than the 180km Range Exocet Antiship missile currently carried by scorpenes . France will also have no problem if India uses VarunAstra Torpedoes or DRDO developed SLCM with these subs .
Spanish and German subs will only be capable of firing Harpoon anti ship missiles and German Heavy weight Torpedoes