AFAIK, the main reason was to fill a shortage of standard artillery shells and to help clear trenches. Disassembly, as you can see, is somewhat dangerous.
The main reason was it looks good for PR and countries that donated them no longer want to maintain a weapon they can't use.
I'll agree with the second half of your statement. Storage and disposal is expensive.
AFAIK, the main reason was to fill a shortage of standard artillery shells and to help clear trenches. Disassembly, as you can see, is somewhat dangerous.
The main reason was it looks good for PR and countries that donated them no longer want to maintain a weapon they can't use.
I'll agree with the second half of your statement. Storage and disposal is expensive.