All just my personal opinion
People probably regard Bach as being the baroque composer, though in aspects like his preference for traditional polyphonic forms such as fugues and canons (he was a master at writing, even improvising the most complex of fugues) he must have been regarded a rather traditional composer at his time. On the other hand, he did expand into new, previously (almost) unexplored keys on the keyboard and thus may have helped advancing music towards the pre-classical era…
(…) Tuning with a tuning meter is different (…) in several ways: primarily, there is no “chained” tuning, i.e., every tone is tuned individually and independently, i.e., the pitch of any string (within the first octave) does not depend on the tuning of any other string, and the resulting tuning accuracy is only given by the accuracy of the tuning of all individual strings — and by the accuracy of the tuning meter. Tuning can be done in the common (and convenient) range a .. a’ for all tuning schemes — or in any other range given by the tuning scheme / table…