Multiple macOS system features are failing

Restart your mac.

If that does not fix it, restart in Safe Mode, and test.

Does the problem go away?

If it does not happen in Safe Mode, does it recur after you start normally?

Please run Etrecheck and post its full report here. Use the "additional text" button and paste the report into the text box.

Two cents here

How to fix this, is above my Pay Grade

From the Etrecheck Report

disk3s2 - Preboot (APFS) [APFS Preboot] (8.11 GB used)

Preboot volume corruption or mismatch

• Preboot is 8.11 GB (should be ~300–400 MB).
• A corrupt Preboot manifests exactly through:
  • Notification Center not loading
  • WidgetKit not loading
  • Siri not initializing
  • System UI servers silently crashing
  • Tips / suggestions daemon not loading

macOS loads all system extensions and per-user metadata from Preboot for a “sealed” system volume.

A broken Preboot means many user-level system processes never launch.

I think that Owl-53 has hit the nail on the head - that corrupted pre-boot volume is likely to be causing a lot of problems.

You should start your mac in Recovery Mode, open Disk Utility and do a Repair on your disk.

Then restart normally, and do a new Etrecheck report.

Post a new report. If what Owl-53 suggests turns out to be the reason I don't know how to fix it. At a minimum, reinstalling macOS will be required.

Reinstall macOS according to How to reinstall macOS - Apple Support, and only after that post a revised EtreCheck report.

Configuration Files:

/etc/hosts - Count: 22

Please read Fixing a hacked /etc/hosts file - Apple Community.

➡️ I put out there for my more Learned Contributors to comment on ⬅️

Not sure this will or will not solve the Corrupted Per-Boot issue

Confirm that the user has access to another Apple computer currently running macOS 15 or macOS 26 (Tahoe).

This secondary system must be capable of performing a Revive or Restore operation on the target Mac’s firmware if required.

Restore should Wipe the Secure Enclave Firmware and the entire drive if everything and lay down a new Secure Enclave Firmware and a new version of Tahoe

Back up a step. What is "multiple system feature failures"? Do the features not work? How do they not work? Behaving in an unexpected way? Not launching? Does your Mac crash every time you try to use one? More information would be helpful here.

👍

Good catch. Something is definitely wrong with that.

You are welcome 🦉-53

Do remember

This has been a collective effort by ALL who have participated in your question which I dare say, I have not often see before today