It is funny that an individual who would never dream of chucking your $40 PS4 controller across the room, has no qualms about pounding his fist on the controls of your $2000 "pride and joy". But some people have grown up with the "drive it like you stole it" mentality when it comes to publicly used stand up arcade machines. Somewhere, there is a mental connection between those machines and one you have in the living room. This might be a compliment to the owner of some nature, but it's delivery can be unpleasant.
I've had several collectors ask me to stop shaking their precious, precious pinball machines.
This one hit me a little close to home. I have only one pinball machine, and am not a "shaker" when it comes to playing it. If someone were man-handling my machine, I would probably wince a bit, but they are built to take it. But I can definitely see someone being overprotective of an old EM machine which might have become more fragile with age. It's not like one can just go down to Walmart and buy another when it breaks. I plan on building a long-overdue digital pin this summer, and I think I would be much more protective of that one. Things like hard drives and flat panels don't like being knocked around as much.
But yes, I am usually just happy when my friends drop by and actually want to play. I'll put up with their idiosyncrasies for the sake of seeing them enjoy themselves. If you are too fussy about how they play, they'll likely never want to again. 
Your quotes show the reason why you earlier posted that you got Bored with pinball machines...
You simply cant play pinball without using "English". The game was ALWAYS intended to be NUDGED!
The older EM machines play slower than the new machines, due to using a lower playfield angle.. and possibly less powerful coils. They also placed the flippers much further apart. Because the ball moves slower... any tap on the cabinet will make the balls vector change drastically. This is why the flippers were so much further apart than the newer machines.
Even though the vector effects are minimized on the new machines... they still are a MAJOR part of how the game is supposed to function. The flippers and drains will eat your ball like Madd... unless you know how to nudge properly, to keep the balls vectors from going into certain areas. As well as having to consider the ball spin... as certain areas of the game will create the spin, and the spin will cause the balls vectors to drastically alter when your flipper hits it.
The only time I ever cringed about pinball abuse, is when someone slides a machine fully sideways a full 6inches. Or when they do a "Death Save" by kicking the front leg when the ball hits the drains apron angle. The machines can handle all of this... UNLESS... the leg bolts were loose / damaged.. from previous poor assembly / maintenance practices. Otherwise.. the machines could easily stand up to any abuse... ESPECIALLY the older EMs, which are build like Tanks. Delicate?! There is nothing delicate or dainty about an EM! lol The EMs well generally outlive the Digitals. The only real failures are from dirty corroded contacts. No Transistors, diodes, or Caps to pop / burn out. No static electricity, no bit rot. No whimpy assemblies that crack with the smack of a few hard balls.
I love both styles of machines, and while Im no master-class pinball player.. I have learned to love pinball After I figured out the art of the Nudge. Sorry, but you are still a clueless Pinball NOOB.