The core is the President is kept from becoming a dictator by nothing more than norms. If Trump staffs the military with loyalists, there isn’t much anyone can do to make him do anything. Most other countries have power over the military, particularly in domestic contexts, much more shattered.
In those "newer designs" there is no electoral college. Also various alternative electoral systems have been tried. The winner-takes-all system of the US is known pathological and inevitably results in a two party system. Democracies in Europe most often result in many parties and a necessity to form coalitions. Ireland even goes as far as using IRV and STV.
The issue isn't even in how votes are counted, it's in parliamentary versus presidential republics.
The latter inevitably slide towards autocracy. Too much power is concentrated in one person, who is almost impossible to legally remove before their term is up, and who will happily punish dissenters within the party.
In parliamentary republics, every PM is one internal party vote away from being deposed. You tend to see less of the tail wagging the dog in them.
I'd love to read about the new designs.