It seems to me that one could argue that every melachah has an element of "מכה בפטיש" (final hammer blow/ completing an object by applying the finishing touches) to it.
As OU Torah explains:
The melacha of makeh b’patish literally means the strike of a hammer but it refers to an act of completion. Any act of perfecting an object or rendering it fit for use is considered makeh b’patish even if it doesn’t involve a hammer (or any other tools).
It would appear that each of the other 38 melachot seem to contain an element of makeh b’patish to them. For example:
Erasing (מוחק)- if one erases a whole sentence, right as they finish erasing it should be a violation of erasing and the final hammer blow
Sanding (ממחק)- if one sands a doghouse, they should be in violation of sanding and (upon completion of the house) the final hammer blow
Sewing (תופר)- if one sews a garment they should be in violation of sewing and (upon completion of the garment) the final hammer blow
Selecting (בורר)- ex: if one separates the desirable portions from the undesirable portions and thus making an inedible food become edible, they should be in in violation of selecting and the final hammer blow
Why isn't one ALSO violating makeh b’patish whenever they violate any of the other 38 melachot?