It makes it so hard to clean. Does that shape have a function? And why aren’t they made to go all the way back to the wall? Cleaning behind it is so irritating.
In: Other
If they were shaped with straight sides then they would either need to fill in all that space with solid material (extra cost and also incredibly heavy), or somehow be hollow which would also involve a bit more material while also adding complexity.
Toilets tend not to go back to the wall because you *want* people to be able to clean back there. Also walls tend to have baseboards of varying size and design, and it would be very inconvenient if your toilet didn’t fit because of your baseboard.
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