Start v7.0 offers many new and revised features:

Start now offers a DropStack for files and folders. Simply drag files and folders with the mouse into the upper free area. As soon as there are entries in the DropStack, they will ...
The new update improves the stability and performance of Start.

The settings have been revised and now offer a dedicated "Appearance" section with more options to customize Start to your own preferences:

Self-defined colors can now be used in addition to the predefined colors for tags and entries. Make your colors even more flexible than before!

According to Apple's specifications, Start uses Apple's sandbox. As a result, Start's access to numerous areas of the system is restricted and only possible after the user has asked. When using Start, you have probably noticed messages from time to time where Start asks for permission to open a folder or file.
For Start 5.7 and 5.7.1, numerous code optimizations and internal adjustments were made. The primary focus was on stability and bug fixes.