I found the latter depressing because its presence implied that it might be needed.

The presence of liquid water under the crust implies that there is an internal heat source.

The presence of a sewer does not necessarily imply that connection is possible.

So, evidently the presence of this structure does not necessarily imply its use in flight.

The presence of x, however, does not imply that y will occur.

Yet as the very presence of the work implies, much remained the same.

She knew what the presence of this book in her room implied.

"So does their presence here imply the existence of a third habitat?"

And the presence of this here implies so much more.

In his poems, the presence of rhyme usually implies irony.