I just meant that you seem unwilling to answer with anything other than a question. Which is (a) rude and (b) unhelpful.
But fine, I’ll bite. I pretty much agree with Anthony Levi that the real object of the reformation was to deal with an impasse reached in the development of scholastic theology, particularly with regard to the doctrines of grace and predestination. Certain strands of Aquinas, Scotus, Ockham, and Biel seemed incompatible with each other, and with scripture. Levi highlights in particular Scotus’s facientibus principle (an attempt to mitigate his strong, absolute predestinarian soteriology): “facientibus quod in se est Deus non denegat gratiam,” which seems a long way from Romans and Galatians; and Ockham’s distinction between God’s potentia ordinata and his potentia absoluta.
Sola fide was an attempt to fix this. Trent was another. I think sola fide does a better job, but they’re not a million miles away from one another.