He begins a sentence, and having begun it, three or four thoughts connected with it slide into his mind, and instead of putting them aside or using them in another place, he jerks them into the middle of his sentence in a series of parentheses, and then inserts the end of the original sentence, or does not insert it at all.

This is irritating except to folk who like discovery of the twisted rather than poetry; and it is quite needless.

It is worse than needless, for it lowers the charm and the dignity of the poetry.
Yet, there is something to say on the other side.

It is said, and with a certain justice, that "the style is the man.

Strip his style away, and where is the man?
Where is the real Browning if we get him to change a way of writing in which he naturally shaped his thought ?" Well, no one would ask him to impose on himself a style which did not fit his nature.
That would be fatal.