It is also good to read scholarly literature about the Latin texts indeed. The sad aspect is as you mention outdated scholarship. I did think that also about this almost 1000 pages book about the Roman Latin litterature The Cambridge History of Classical Literature 2. Latin Literature is almost 40 years old as it was published by Cambridge University Press already in 1982. I was thinking surely there must be much recent new results and insights of the past 40 years made in scholarship of Roman litterature.
When talking about outdated scholarship I meant scholarship
in Latin, mind you - when it comes to the classics, 40 years is as good as modern; besides, I don't imagine there's been enough real or theoretical discoveries that would result in any notable revisions to such a general overview. There have been quite a few more narrow and specialised studies though, or ones looking at the subject under different lenses - especially it seems when it comes to drama.
Oh, there is Michael von Albrecht's
Geschichte der römischen Literatur von Andronicus bis Boëthius (3. Aufl.) together with its English translation
A history of Roman literature: from Livius Andronicus to Boethius, available at a certain Library Genesis.