I can see the educational value in that.
For me, I just want to make sure the magazine
feeds the round(s) properly.
Kid: "Wish we had time to bury them fellas."
Josey Wales: "To hell with them fellas. Buzzards got to eat, same as worms."
Clint Eastwood-The Outlaw Josey Wales
A few centerfires are damaged by a lot of dry snapping without a snap cap but most are not. Many, maybe most, rimfires get a dimple peened into the chamber recess where the rim seats if they're dry fired a lot. Fortunately, the small yellow plastic dry wall anchors that are usually sold in packs of 100 make great .22LR snap caps. They do not last forever but at pennies apiece who cares. Working the bolt or slide manually so far they've fed through all my guns.
In the big guns an unexpected snap cap reveals a beginner's or your own flinching. Even in .22LRs they'll show a twitch instead of good follow through. Not knowing which revolver chamber will come up with no live cartridge is great practice.