Afaik Apple's switching power supplies support the specifications you described (for example, see Mac Mini's tech specs https://www.apple.com/mac-mini/specs.html -- 50-60Hz 100-240v AC).
Not to mention Apple sells region-specialized units just like every other major computer retailer.
The reason why this isn't is that Apple needs to comply with European laws and standards in Europe. Not in the US or whichever other hellhole uses 110V 50Hz mains.