Their reasons may be completely valid in terms of their own thinking.

"I'm simply raising a completely valid point."

I think this is the biggest point in this long running saga, and it is completely valid.

Mr. Ellin says the comparisons are not completely valid.

However, the Nexgen chips do not include a math co-processor, so the price comparisons are not completely valid.

He who had wiped out all the rest of the Royal Family had himself set up a pretender with a completely valid claim.

He made the completely valid point that "the president of the United States has been breaking the law, repeatedly and insistently."

Thus, all confession acquired by means of torture were considered completely valid as they were supposedly made of the confessor's own free will.

It's completely valid to come to the conclusion that someone else can't be a worthy audience, conversation partner or otherwise interact with you.

The other concern regarding diverting software development resources is a completely valid criticism of the analysis.