Short answers, pulled from the story.
Petrarch published his Epistolæ familiares in 1359. This publication marked a deliberate break from medieval Latin traditions and initiated the humanist movement.
Scholars insisted on writing ae out fully instead of e and demanded strict distinctions between t and c despite palatalization. Erasmus proposed abolishing traditional pronunciations in favor of reconstructed classical sounds even though he used ecclesiastical pronunciation in practice.
Renaissance Latin served as a measure of personal refinement and intellectual achievement rather than for daily understanding or practical communication. Schools across Europe taught humanistic spellings while excluding later Latin literature from curricula to promote works from the golden age.
Giovanni Boccaccio published Genealogia deorum gentilium in 1360 and Antonio Beccadelli wrote Hermaphroditus by 1425. Lorenzo Valla produced De elegantiis Latinæ linguæ in 1441 and Leonardo Bruni completed Historia Florentini populi in 1442.
Achieving grammatical accuracy and stylistic fluency often came at the cost of clarity needed for technical subjects. The standards that made Renaissance Latin elegant created barriers to discussing modern topics effectively despite its continued use as an international medium.