Okay so I thought of one this morning, and it may not be patch Tuesday, but hey, it's technology related! Twelve security patches!
I prefer my patches in a predictable schedule for some reason. I'd rather be able to install all the patches I need in a single run per month, or be not aware of any such patching... Patch Tuesdays sure make my life... easier, since I can pretty much just go with "shut down on the second Wednesday night of each month" to get patches installed. (Exception: out-of-band patches.)
Apple replaces them anyway, if it's otherwise under the warranty. When I took my JBed iPhone in for reception issues, I just moved cydia to the last page. If they even noticed, they didn't do anything about it.
Usually, if the modification isn't obvious, you get away with it. Sometimes, though, you really want to play it safe, as there seems to have some cases with some manufacturers where the warranty
is voided.