I have been wfp for around 6 years and I don’t think I have ever lost a customer due to "windows left wet"
I think the real reason you blade after is because you don’t trust yourself to do the job properly in the first place. You need to learn to trust your equipment; many thousands of pounds and man hours have gone into developing it. AND IT WORKS!!!!
ALL my customers know their window will be wet when I am done, they also know that they will dry within a short time, (they are all sensible adults)