you worry too much…
you will be hard pressed to implode your glassware by sucking on it with a water aspirator. I’d state it was impossible, but with damaged glass you might be able to manage it.
even using the biggest pump he could find @BrotanicalMatt couldn’t manage it
too much vacuum on your rotovap is a functional problem. if you suck too hard all your shit boils over and fouls the condenser.
if it’s not boiling too hard, you’re not sucking too hard.