Sentence examples for problematical but necessary from inspiring English sources

In non-randomised studies the case-mix adjustment is problematical but necessary [ 36].

OBJECTIONABLE, but necessary.

A disturbing but necessary book.

But necessary, certainly.

But necessary for whom?

"These planned reductions are regrettable but necessary.

"So it was unfortunate but necessary".

But necessary.

Ruthless but necessary.

Hard-hearted but necessary.

The message is stark, but necessary.