Modern work can consolidate, not only using texts but archeological evidence to back things up and discover everyday aspects classical scholars may not have seen the need to mention but which can make all the difference. I certainly wouldn't advocate not using classical texts, but I often find it useful to have a more modern work at hand (or preferably, more than one!) that can shed more light on an issue through a consolidation of sources and the use of additional research. Frequently, it makes it a lot easier to put old texts into perspective. Admittedly it might not add much new information, but a modern work makes it possible for us who haven't (yet) had any formal training to create a solid foundation from which to try to understand the past without years of experience.
Besides. It has been said that only one in many modern works is useful. Was it truly different in the classical times? Even the greatest works are often fragmentary, but there must have been many, many more works now completely lost which weren't of as high a level.
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