A wide-gamut monitor doesn’t only “become Adobe RGB” inside Photoshop—it can display that larger gamut all the time. The point is that it can show colors your old sRGB display could not, which is useful for editing and print work.

If sRGB images look overly saturated, that usually means the app is not handling color management properly. On a wide-gamut display, non-color-managed software can make normal sRGB files look too vivid, especially reds and greens. The image itself is not changing—you’re just seeing it incorrectly in that app.

Proper workflow:

• Use the correct monitor ICC/profile in Windows so color-managed apps know how to display color properly.
• Use color-managed applications for editing and viewing when accuracy matters.
• If your monitor has an sRGB emulation mode, that can be useful for previewing how images look on typical displays or in non-managed apps.

So: yes, an Adobe RGB-capable monitor is valuable, but outside color-managed software, colors may look wrong unless the app and system are using the monitor profile correctly.