The Traditions of the Best English Poets

I wonder now if what you claim is true:
that all the versifiers of the golden age of poetry,
when reigned Will Shakespeare and his ilk
(Rossetti, Marlowe, Milton, Donne, Traherne, Carew)
and those who wrote before free verse became the rage,
like Browning, Byron, Shelly, Keats and Pope,
Thoreau, and Hardy, too,
felt free, if not obliged, to give
all leave unto themselves
to think it so that they, to get a cunning verse
or two,
had liberty, indeed a mandate then,
to throw good grammar to the wind,
and felt that it was never sin to leave out articles
and other parts of goodly speech
in order not to breech the all important sacrosanctity
of well maintained precisioning within
the measured rhythm and the length of line
they knew (or so it’s claimed)
they had,
upon the pain of being thought
poetically incompetent, untalented,
and lacking inspiration and the gift
of literary grace,
to cast their verses in
if they were ever to achieve,
to win,  the knowledged critics’
and the educated reading public’s accolades?

Is there any concrete evidence for anyone
assuming so?
I’ve never seen a whit, seen neither hide nor hair, of it.
But if you think you’ve found such
in their work,
I beg you this with me, as soon as possible,
to share.