This was happening to people I knew when I lived in Japan 30 years ago. Many people were using wa-puro (word processors that let you type in the phonetic form and choose from the appropriate kanji). I imagine the effect is far more common now.

I remember one time when a university engineering professor couldn't remember how to write the kanji for "police". He didn't seem embarrassed asking someone else. I don't know if they still do, but they would often demonstrate by writing out the character with their index finger like a pen in the other hand's palm.