Your new interstellar generational colony ship may have the latest KAL9000 at its heart, but what about the space dock and refuelling station that was built before you unlocked the KAL9000?
When it comes to computer tech, there's generally never an advantage to using old technology else computers would never advance. Unlike ,say, engines where an old, less powerful model may have an advantage due to size and/or weight, new computers can always outperform their old counterparts.
In sandbox, anything other than a KAL9000 is redundant, but in career all your fleet will have less powerful systems unless you specifically replace/upgrade them.
What I'd like to see is the early tech cpu deliberately throttled in its processing speed, not just memory size.