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IF resistance to insects (herbivores) benefits plants, THEN why aren't all plants now resistant?

IF resistance to insects (herbivores) benefits plants, THEN why aren't all plants now resistant?
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Resistance to insects plant is relatively expensive and has some drawbacks. Sometimes sunlight breakdown some time rain was it from the plants which obstacle to develop insect resistant plant. As we know that Bt. Is one of the successful insect resistance plant but Bt. must be applied exactly where and when the target insect of feeding and the most consumed quickly before it disappear when we develop plants which is resistance to insect a small proportion of the best population may survive exposure to the materials due to their distinct genetic makeup. This individual pass along the genes for resistance to the next generation

If an insecticide with the same mode of action is repeatedly used against an even greater proportion will survive. Ultimately the ones effective product no longer control the resistant population

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