Maintenance is an often ignored life cycle cost factor. Especially for complex systems, e.g. planes or ships or stuff like that. The longer a system is operated the higher the obsolescence risk gets. In part because the need for spare parts is much lower than during initial production. With life cycles for individual components getting shorter keeping the cost effective mass production up is not worth it. And then system get really expensive to operate. Militaries all over the world feel the impacts.
That being said, the extension of maintenance, supply chain and logistics, is even more often ignored. I think modularization is a potential solution in the future, at least foe the defense sector. In civil aerospace the maintenance problem is under tight control, an aircraft that is not flying is just a cost factor. But then there is a lot of competition for civil aircraft maintenance, so single aource suppliers are rarer than for defence.
That being said, the extension of maintenance, supply chain and logistics, is even more often ignored. I think modularization is a potential solution in the future, at least foe the defense sector. In civil aerospace the maintenance problem is under tight control, an aircraft that is not flying is just a cost factor. But then there is a lot of competition for civil aircraft maintenance, so single aource suppliers are rarer than for defence.