The above quote is indicative of the type of superiority complex in this thread and others. Who cares if you want to call a clean game more than what the established rule is. Just don't insinuate those that don't appeal to your way of thinking as not making sense.
Wow. It's hard to know where to start with this. You either have a problem with reading comprehension, or you're intentionally being dishonest about what I've posted. "My way of thinking" is sincerely asking why it shouldn't be required to knock down 10 pins with 2 balls, even in the 10th, to be awarded a clean game. If your best answer is to blindly support a rule without providing any justification, why bother? It doesn't add anything to the conversation.
Here is why I brought up Glenn Allison.
Everyone should probably be able to agree, that in 1982 when Glenn rolled his 900 series, it was much, much, much
harder to strike, let alone string strikes, and subsequently, make spares. There were only a handful of options to use for bowling balls, and there wasn't a huge difference between those balls. If a rule that history has shown, just doesn't make sense based on how the game is played today, it's only logical to look at updating a rule, or at minimal be understanding to why a rule is in place. This brings me to the one mark rule of the tenth frame. Back when the rule was originally written (not sure how long ago, but I'm sure it's been many many years written as such), because strikes were fewer and further between, being able to at least throw the first strike in the tenth WAS an accomplishment, and could be rewarded as such. People want to use 1950's standards for achievements, while bowling in the current environment. Give everyone a trophy I guess.