Aziz Başkan is currently changing Caspian dynamics and busy make Africa great again. lol. Jokes aside, Dearsan is a tremendous success story in the Turkish shipbuilding industry. Professionalism and patriotism have equal weight in this story.According to the catalogue AS 3600 has 4500 mile range whereas 3000ton Istif Class has 5500-6500mile range(wikipedia)
AS 3600 might be overloaded and sacrificed the range.
It seems Istif Class very well designed.
So if you want to expand national interests , you need more than as 3600.
IMO we need heavier frigates for instance Dearsan TF142 ( Arrowhead çakması)
Dearsans TF142 has proven design rather than TF4500
I would love to see an alternative program run by the private sector in parallel with the national warship programs, even on a pilot scale. I have written many posts on this subject in the past. Therefore, it is not possible for me to disagree with what you have written.