"We are under a Constitution, but the Constitution is what the judges say it is." NY Governor Charles Evans Hughes, 1907.
No English sentence is without ambiguity in its meaning. If a controversy over meaning arises on a matter as important as law, we cannot function as a nation on the basis of, "Aw, everyone knows what they meant...".
Whether the courts are currently too flexible is a matter of opinion, and unless you get nominated personally to the SCOTUS, an inconsequential one.
And how did the "legal scholars or judges of merit" interpret the 2nd amendment in 1800?
The same way as today?
The constitution seems to have become a lot more flexible today than people should be comfortable with.