This app has a very specific purpose - browsing and interacting with your files. It remains light (no incurred battery usage) and doesn't pollute your phone with new apps to open your files but instead uses your default applications for that.
Amaze File Manager can connect to SMB shares (AKA samba, AKA window shared folders).
Press the "+" button, then "Cloud connection", then "SMB Connection".
That's an easy way to access your phone filesystem from another device. But be careful when using it on untrusted networks, because FTP protocol has encryption.
No other features such as networking connections, junk flies cleaner, built-in media player/viewer/editor. But that might be a pro, since nothing else is asked for this app permission.
The developer has chosen to not place the app on the Play Store but to offer it for free on the XDA forums. This may be inconvenient for some as the app will have to be side loaded.