No way I would go so far as to use terminology like “blasphemous”. It falls into the arena of what is or is not proper “matter”. I know the rules, but I can’t keep the terminology straight. I know that our parish is doing it right, and that’s as far as my concern goes.
As for your last question, the Catholic Church believes that the whole Body, Blood, Soul, and Divinity of Christ is contained in either species. For centuries the laity were given only the Host, and not the Cup. It has been only in the past few decades that the Faithful have been allowed Holy Communion in both species, but there is no requirement that they receive both. In our parish, many receive only the Host, and pass by the Cup.