Why has this become so commonplace, and is it even appropriate?
What's exotic to a foreigner may be commonplace to you, that's valid criticism.
Insulated from ruin, networked into success, failing upward and retiring in splendor are commonplace.
Cobbling together free childcare or eldercare provided by relatives is commonplace because free is all they can afford.
If you come across a passage you like, copy it out into a commonplace book.
Finally, there was the pressing necessity of putting food into his mouth, a commonplace but still cogent consideration.
It is a curious question why sacred song should so often be dull and commonplace.
Tis a short feast and a long famine, said a northern liveyere, quite cheerfully; to him it was just a commonplace fact of life.
The "missing fourth side" of the room is a commonplace recognized by all.
A word, or a gesture, which in ordinary living would be commonplace, acquired a meaning and a significance all its own.