Why shouldn't I quite frequently and generously use the dreaded adverb superfluously in my wonderful writing?

The answer is in the question. If it is superfluous, then you don't need it. Concise writing is effective writing. When you add superfluous words, you create waffle. Use words when they are required to convey meaning. Omit words when the meaning can be conveyed without verbosity.

Using a thesaurus allows you to be specific in your choice of language. You can choose words that convey the meaning, without the addition of excess adjectives or adverbs.

That's not to say the other extreme is perfect. Adverbs have their place. I wouldn't go to extremes to avoid adverbs any more than I would try to increase their use. Simply use them where it feels natural.