oh resizing is already mandatory I am afraid. When the object inspected is big, there is no other option but to resize the whole window. And many if not most useful Pharo objects worth inspecting are big.
I rarely have to resize it (arguably I'm not using to full potential); but my point was that there should be sensible defaults for both primary (most common) use cases. You can never satisfy everyone 100%.

Plus resizing windows is part of the experience of using a window GUI system.
As a long time user of dwm the very idea of resizing windows with mouse is repulsive to me. (I still struggle in this respect with Pharo... but I have a dream. :))

Peter