Instead of saying "wasting", OP should have said "emitting CO2 to the atmosphere", which is the real problem here. Including from refinery flare stacks, and emissions of non-CO2 GHGs like methane from leaks.
Unbalanced fractions aren't so much of a problem as they can be cracked.
To be pedantic, assuming the fuel is used in a combustion engine, there will always be a percentage of the fuel wasted as heat energy. This depends on the thermodynamic efficiency of the engine and various other conditions, of course.
Burning it isn't wasting it, we get a lot of value out of that.
> How much percent recyclable plastic could we extract out of raw oil? Like real recyclable plastic, where it is worth money to do so.
0. There's no such thing as real recyclable plastic, unless you count burning it for heat/power generation.
> Maybe making more bitumen/asphalt for roads/roofs, or graphite for batteries?
Every fraction of oil has some use. But you're unlikely to get perfectly balanced demand for every single thing you can pull out of it.