Why do we still have to activate extension?

Hi,
one classical necessity of ArcGIS is that extensions have to be activated.
I would like to ask the Esri-Programmers: Why is this step still required?

Since version 9 or so, many tools and functions including the ones provided by the extensions are grouped in the tool box.
For many users the toolbox window is generally open on the desktop, giving you the impression that these tools are readily available.
This is not the case for the extension tools (like 3D analyst, spatial analyst). Those extensions have to be activated before the toolbox items work.

This step is redundant and annoying in my opinion and should be removed in the next version of ArcGIS.

Best regards,
Jan