Having worked on SW for years developing SW for very large customers, here are a couple things I have learned:
- The ideal replacement SW does everything the original SW does.
- The settings for the original product are migrated to the new product.
- If the presentation changes the new product must have equivalency.
Even before starting the re-write these goals should be first on the radar.
From what I have seen Logos 4 does not meet these goals; thus it fails as a replacement product for Logos 3, not trying to be mean, just stating what my customers would tell me.
I do believe Logos 4 is salvageable and should be considered "beta" at best, the product still needs a lot of work to meet the goals specified above.