Since it is widely regarded as perverse and counterproductive to require programmers to write in assembly language, language designers who (in effect) forbid the use of available features must have had something in mind.
Or did they? It appears if they thought about it at all, what they had in mind was that those features were useless.
Or useful only to numerical experts who somehow would not mind writing in assembly language(!?) Or violated portability constraints (more tomorrow about this).
Or that the language designer could make the best choice for all users.
Or that the language designer should leave these issues as platform-dependent or implementation-dependent thereby promoting chaos, the ultimate goal of computer scientists.