Not sure the best way to word this. Why is it that some sounds from a loanword get combined down to a shorter or different sound while other do not? Here are some examples: Shortened, but sound ...
I've noticed that sometimes loan words (usually pairs) are truncated to just the first two morae from each word: Smash Brothers ➤ スマッシュブラザーズ ➤ スマブラ "Don't mind." ➤ ドンマイ I assume this is ...