These words can cause difficulties spelling wise.
Examples : mnemonic, psychology, ballet.
When spoken the silent letter cannot be heard but we need them when the word is written.
Some silent letter words are used to distinguish between homophones (words that sound
the same but are spelled differently and have a different meaning.
Examples Scent, sent, cent.
Will there be a standardized English spelling in the near future?
Do not hold your breath for that to happen.