Look at the wording of the guaranties of a majority of telescopes sold during the Halley Comet era or even today. They do not guaranty any type of wave front rating or passing any type of optical test. They guaranty your satisfaction. So unfortunately if you do not understand how to critically evaluate optical quality and the image that typical 1/2 waves optics produces is fine for you then the telescope manufactures are happy to continue to produce that quality. If your not happy then you can return the scope and try another and another to you find one that you are happy with but unless you know how to test the optics, the one your happy with can be not much better then 1/2 wave.
Here is a link to Celestron's warranty. I can not find anywhere where it states what the spec's are on their optical quality. Maybe I missed it but if not, then it is what they determine is "good". So you either live with it, try another scope to see if it is better or get your money back.
Here is a link to the Celestron 1972 literature when they first started selling the orange tube models. https://wiki.telesco..._Literature.pdf
Here is a quote from that literature that does have specs that can be tested against to see if the scope they sold at that time meet their spec but at least you had something spelled out that you could test against to see if the optics meet their spec.
Optical testing and Guarantee - Each of the
three components in the objective system of the
Celestron (primary mirror, secondary mirror, and
Schmidt corrector) are manufactured to such exact·
ing standards that good performance could be
achieved by simply randomly assembling these
components into a telescope. We are not satisfied
with just good performance, however. We there·
fore set up each of these optical systems in a laser
collimator capable of detecting 1/100th wave
errors. We then carefully hyperbolize the secondary
mirror to bring the optical system of each Celestron
to a perfect optical null. The Celestron optical
guarantee is as follows: using a point source at
infinity (star test) and with the system properly
collimated, a knife edge shall indicate a clean optical null; when tested with a l00-line Ronchi
grating with three lines intercepting the cone, the
shadow bands shall appear straight. The intra and
extra·focal diffraction patterrns shall appear similar
in regard to the central obstruction using a 12
mm ocular with the out-of-focus blur circle filling
1/3 of the field. Further, each Celestron is guaranteed to be free from defects in material and workmanship for a period of one year subject to repair
or replacement at our factory.