Because they were uncomfortable at game start and could not keep the research slider at 100%. Even you posted that having the research slider at 70% was untenable. So which way is it now?.
I agree, the research rate should be based on your game decisions. You should not be able to keep it at 100% all the time, unless you sacrifice other choices.
If I was to put a limit (which I would not) - it would be no more that 10% research. Even at 0% you still get some research from buildings. If you have decided to build them.
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