I was glad to see lots of other comments. This question actually seemed really straight forward to me but maybe I'm looking at it wrong?
I simplified the logic as:
If (Greater heat resistance) AND (comparable) then preferable
And we are told that although some vacuum tubes meet the first half of the sufficient condition (Greater heat resistance), all vacuum tubes fail the second required condition (comparable).
As a result of failing the full sufficient condition, it is insufficient to trigger the necessary condition. In other words, even if a vacuum tube has greater heat resistance, none of them are comparable, therefore none of them are preferrable.
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I was glad to see lots of other comments. This question actually seemed really straight forward to me but maybe I'm looking at it wrong?
I simplified the logic as:
If (Greater heat resistance) AND (comparable) then preferable
And we are told that although some vacuum tubes meet the first half of the sufficient condition (Greater heat resistance), all vacuum tubes fail the second required condition (comparable).
As a result of failing the full sufficient condition, it is insufficient to trigger the necessary condition. In other words, even if a vacuum tube has greater heat resistance, none of them are comparable, therefore none of them are preferrable.