I think the current system is already a decent middle ground. IRL countries can't switch away from decades of military thinking into some radically different line of thought within a year. Switching would take years or even decades. In HoI4 you can now do it within a year, which is more than generous.I am considering dropping the cost of the initial level a bunch so its cheaper to switch. not a big fan of getting 2 free techs off the bat using the exploit. To me its the same as saying you want to be able to change your starting templates and army setups for free on start.
People are only complaining because they are used to the exploit. If it had never existed, I doubt people would even request free doctrine switching.
It's the same with e.g. one-division-training*. Lots of people love it and think it's just a "clever use of game mechanics", even though it makes no sense and is clearly an exploit. If/when that is fixed, I am sure there will be people requesting it back, claiming that exploit was somehow a necessary part of the game.
*Farming army XP in the most cost-effective manner by disbanding all but the largest division in the player's army, and then turning equipment off in the template designer.
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