(assuming sarcasm) edit: <- directed to a post that was deleted

Some things just click better for others and some of them require more of an explanation? I don't see what's so baffling about this or why people are complaining about an explanation. Proofs are definitive but they don't really help you understand what's going on a lot of the time.

0.999... confused me when I first encountered it but when I thought about what an infinite number of 9s would mean it clicked better. Something else I didn't initially believe despite proofs was the Monty Hall problem, but imagining it with 1,000 or more doors instead of 3 made it clear why the odds weren't 50/50.

In line with how you were able to understand the Monty Hall problem, one key to understanding this issue is realizing that:

infinity + 1 = infinity

I think the hurdle here is: "0.0001 is between 0.999 and 1, so for every additional 9 you put after that decimal point, I can put another 01 thus making a number between 0.999... and 1." This turns into a race to a non-existent finish line.

Personally, picturing the digits never did it for me. I think I work better when thinking about quantities and values: the infinite number of 9s means the value will continue increasing until it gets to 1. Or just understanding that 0.000...001, an "infinitesimal" quantity, is the same as 0. Something like that.