Not really. VFR and IFR are such different systems. A prudent IFR-rated pilot who flies an IFR rated plane would only fly VFR if he is sure that the weather is fine.
IFR is much more professional, VFR is mainly for leisure flights. You don’t mix both unless you have no choice.
You can’t start VFR, and choose mid-flight to switch. If you planed a VFR flight and the weather becomes bad, you divert or turn back. If you planed an IFR flight, you take-off IFR.
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