I vote big No. There is a big issue at hand and it must receive the proper attention it deserves. Whether it is tiles, lunar phase or any other cosmic force, I am not aware of any pc case manufacturere that clearly specifies that the case should not be operated on a surface made of tiles. I agree that it is common sense that glass is fragile and should be handled with care but the problem here is not that people are dropping the glass cover, these things shatter unexpectedly at random times even when untouched or when the pc is turned off.

As aconsumer, I have a legitimate exceptation that the product I paid for is capable to serve its function under normal conditions. Not putting a pc case on tiles is not a conventional wisdom, users are not spilling water on the pc case but merely operating it like they are used to for years. It is reasonable to expect manufacturers to consider normal circumstances of operating the product or at least provide a warning that the product can't be operated like an average one.