Ti is not my problem.Russia, EU, US & probably even China all have projects for high altitude(near space) "manned" aircraft and the fact is within the next 2-3 decades spaceflight will more likely than not become a daily routine for more advanced countries and countries without that tech will have no choice but to become puppets of or under the control of countries that do possess that tech. And that means Iran cutting funding for Space Program and slowing down advancements in space launch vehicles is probably the biggest historical mistake of the Rohani administration.
That said, I honestly don't see how any well informed Iranian (such as yourself) can make a logical argument against Ti production especially since nearly half it's mining & production process is nearly identical to that of AL mining & production that is also vital for Iran to increase and when it comes to Ti production it's not a matter of technology rather funding. Not to mention the fact that due to sanction on our Oil industry one of the best way's to circumvent these sanctions so they can turn in Iran's benefit in the future is to use our own fuel to increase domestic production and by producing Ti we'll be hitting two birds with one stone both by satisfying the needs of our Aerospace industry & automobile industry for Al & Ti and by turning our oil into product because Ti & Al production require a lot of energy which we have an abundant supply of that we can turn into easy to produce Diesel rather than sell..... Add to that advancements made in Ti casting and Ti printing with ample Ti mines at home and I honestly don't see why we haven't done this already and I believe IRGC should be leading the way when it comes to Ti production at home since it seems that they are the only ones that can actually get things done.
It's funny how we Iranian's have no problem if our government goes out and spends $20 Billion USD on foreign passenger aircraft but God forbid we spend $1Billion on production of Ti to slowly work towards developing the supplies and infrastructure needed to produce our own passenger Aircraft, fighter jets,.....
And Iran investing in a domestic 5th or 6th gen Ti based airframe & a high thrust engine isn't simply about the fighter jet because advancements made in that technology in the defense sector will trickle down to your Civil Aviation sector and your ability to produce more capable Passenger and transport Aircraft just as the production of Military Naval vessels trickled down to Iran's civil naval sector because at the end of the day many of the requirements from human resources to part, materials, tools and infrastructure are very similar and in the future we will need that very same infrastructure for near space and in the future space flights and we achieve today has to also take into account what we plan on achieving both in the military and civilian sector 30-50 years from now.
I say if Iran can go different ways and skip an entirely new metallurgy school which is also a expensive one, it should do so.
If its not possible, then Iran should produce Ti alloys.
We observe an asymmetrical approach in Irans actions to compensate shortcomings in resources. Basing new systems on inexpensive materials is one of such approaches, skipping a mach 3 rated turbofan and go for a liquid rocket motor based propulsion is another.
Iran is not China to create equivalents to what Russia, France and the U.S have.
The IRIAF is already playing the catching-up game with aluminium airframing for the Kowsar... while the IRGC-ASF goes fully asymmetrical.