I was reading about Russia's plans to detach their modules from the ISS before its deorbit and use them to begin a new space station. The Zvezda (DOS-8) and Poisk (MRM-2) are planned for inclusion in this new station, plus the Nauka (FGB-2), which has not yet launched. This can't be done with the other modules. The estimate is that sometime in the 2020s it will be necessary to do a controlled deorbit and these modules will be lost, even though some of them will still be quite functional at that time and could have continued service.

Why was the choice made not to include mechanisms for disassembly in the design of these modules?

I was reading about Russia's plans to detach their modules from the ISS before its deorbit and use them to begin a new space station. The version I read said Zvezda (DOS-8) and Poisk (MRM-2) are planned for inclusion in this new station, and there are variants on that plan. The Nauka (FGB-2) would go, along with the hub module (Uzlovoy module) that will later dock to it, neither of which have yet launched. This can't be done with the other modules. The estimate is that sometime in the 2020s it will be necessary to do a controlled deorbit and these modules will be lost, even though some of them will still be quite functional at that time and could have continued service.

Why was the choice made not to include mechanisms for disassembly in the design of these modules? They were designed to be modular so the ability to swap out old ones for new ones must have been discarded for specific reasons.

I was reading about Russia's plans to detach their modules from the ISS before its deorbit and use them to begin a new space station. This can't be done with the other modules. The estimate is that sometime in the 2020s it will be necessary to do a controlled deorbit and these modules will be lost, even though some of them will still be quite functional at that time and could have continued service.

Why was the choice made not to include mechanisms for disassembly in the design of these modules?

I was reading about Russia's plans to detach their modules from the ISS before its deorbit and use them to begin a new space station. The Zvezda (DOS-8) and Poisk (MRM-2) are planned for inclusion in this new station, plus the Nauka (FGB-2), which has not yet launched. This can't be done with the other modules. The estimate is that sometime in the 2020s it will be necessary to do a controlled deorbit and these modules will be lost, even though some of them will still be quite functional at that time and could have continued service.

Why was the choice made not to include mechanisms for disassembly in the design of these modules?