I regard texture similar to the function of taste buds in our mouths. But in a visual form. Texture does create a specific flavour which affects our senses.
Let us dismiss, as irrelevant to the poem per se, the circumstance ... which, in the first place, gave rise to the intention of composing a poem that should suit at once the popular and the critical taste.
Some to conceit alone their taste confine,
And glittering thoughts struck out at ev'ry line;
Pleas'd with a work where nothing's just or fit;
One glaring chaos and wild heap of wit.