What Apple Focus does not do to your Mac desk
macOS Focus Modes silence notifications. They do not launch your apps, close the rest, or restore a window layout. That gap is a real desk, not another Do Not Disturb.
Focus, as Apple means it
Apple's Focus Modes are a notification filter. Work can silence Messages. Sleep can dim the Lock Screen. Do Not Disturb can stop banners from sliding in while you finish a paragraph. That is useful, and it is also the whole job: which interruptions are allowed.
Nothing in that system opens iA Writer, closes Slack, tiles a research browser to the left display, or puts last night's windows back when the meeting ends. You still rebuild the desk by hand.
A desk is a different problem
Most people who say they want to focus on a Mac are not asking for quieter banners. They are asking for the right apps, files, and sites to already be there, and for the rest to get out of the way. That is a workspace problem. Apple's Focus does not save window positions, does not launch a kit of apps, and does not restore what you had before you switched.
Amhara Sessions are named desks. Activate one to close apps that are not part of that session, launch the apps and sites you chose, arrange the windows across your displays, and optionally snapshot the desk you are leaving so it can come back when the session ends. You can start a session from the menu bar, the Amhara window, a keyboard shortcut, a schedule, or a matching calendar event.
Use both if you want both
Notification Focus and a named desk are not competitors. One decides who can interrupt you. The other decides what is actually on screen. Amhara does not replace System Settings → Focus. It does the part Apple leaves on the table: the Mac in front of you.