An amusing concept that we are "enthralled" ( captivated and charmed ) by visitors on the ground ! You think ?
In reality a quick visit is sometimes possible. There are a number of realities to be aware of however. In some countries the start of the aircraft turnaround procedures cannot commence until all of the passengers are off the aircraft. This includes the all important security checks. Cleaners may not be able to board. The next crew may even be prevented from boarding until all passengers are off the aircraft. These folk who are also very constrained by tight turnarounds or the need to complete their tasks within a defined time period may be very un-enthralled at being kept waiting.
If a request can be accommodated it probably will, but the realities may differ from your perception of them, so don't be surprised if such accommodations are not forthcoming. In the days when in-flight visits were possible and time was less of a constraint, the times when those visitors "enthralled" us was few and far between. It is now much more difficult and our ability to be "enthralled" less likely.