I've read too many arguments against HTOHL to agree with you. It ultimately comes to mass fraction. VTOL leaves more infrastructure on the ground than HTOHL and therefore has better mass fraction to orbit.
Now, TSTO is a different story. If
you can build a big enough carrier aircraft capable of high altitude, high speed flight.
Horizontal takeoff is not desirable for getting to orbit. It is desirable for flexibility in orbital insertion. Something that is not a high priority unless you need fast deployment.