The theories we use to describe these forces are dramatically different, though.
All other forces are understood as the exchange of quantum particles.
Gravity is understood as curvature of spacetime.
There is no a priori reason things with disparate explanations should have similar effects.
I don't know anyone who doesn't agree with you that it seems obvious, but the logical ideas (math) uniting QM and GR are as of yet still unknown.
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