Yeah its a tough job and you need passion to maintain black rides, but Not for you, as you are not maintaining it, you are just keeping is dust free and that too by a wrong method. The word maintaining means = Keeping it the way it is,, But you are inducing swirls on her daily,, So dont use the word maintaining in your case 
Regarding the recommendations you just mentioned : these are ill-logical recommendations.
The finishes we have today, everything is cured and ready before it leaves the factory. Paint is NOT the the last thing to be done on car.. Its the first thing an un-assembled car gets. The Chasis / Body is painted and cured, and then its sent up to the assembly line up belt to start the assembling. So by the time the car gets to the 1st customer, it had already been around a month since painted. Even if it hadnt been a month, The assembled car is ready to go right out of the factory since its paint is baked at such high temps.
The point which you mentioned goes correct If it is a repaint, then you need to wait at least a month before applying sealant. Like being painted in open sky like 95% of workshops here do!!!
Secondly bro, the best case scenario is to make the paint swirl free before sealant, hence the need of light polishing comes. Polishing removes light swirls and leave a smooth finish to be sealed. Visit any Honda / Toyota etc dealership and you,ll see swirls on those brand new show cars parked nicely inside the dealership.