I just want to know whether this sentence is correct: "method A introduces a lot of variety in the structure of X"
2 Answers
Some people would dislike it, but the usage is accurate since variety is quantifiable - a little or small variety would be a few different things, versus a lot of variety or a large variety which would mean many different things.
A small variety of flowers would be, perhaps: roses, daisies, sunflowers.
A lot of variety in flowers (say selection at a garden house) might be: roses, daises, sunflowers, daffodils, tulips, rhododendrons, and more.
It seems the consensus is that 'a lot of variety' is technically correct but perhaps too informal. I wonder whether it makes sense to describe a structure as having variety - isn't it the elements of the structure that would be varied? Otherwise, you might say the structure is intricate or ornate. Here's another suggestion: Method A introduces more variation to the structural components of X.