As per emails in 02-03/2018 between James Hare, Srishti and me.

This task is about MediaWiki-extension-requests vs. Technical-Tool-Request
This task is not about Possible-Tech-Projects vs. Outreach-Programs-Projects - see T189101 instead.

Currently,

• The workboard of Technical-Tool-Request is not used.
• The workboard of MediaWiki-extension-requests has columns such as "Does This Need To Be an Extension?".

In my opinion:
MediaWiki-extension-requests is a subset of Technical-Tool-Request, literally an implementation detail.
I slightly prefer option b) but really up to whoever feels responsible:
a) Technical-Tool-Request should remain the catch-all to triage (which requires someone to feel responsible to regularly triage)
b) MediaWiki-extension-requests should be merged into Technical-Tool-Request and the workboard of Technical-Tool-Request should be used to categorize the implementation detail ("MediaWiki extension", "Tool on Toolforge", "JavaScript Gadget", something else?). Again someone with development knowledge would need to triage the 'Backlog' column and drag task cards into the corresponding 'implementation style' column.
General docs: https://www.mediawiki.org/wiki/Phabricator/Project_management#Typical_uses_of_workboards

if changes are wanted, we'll need to check project descriptions of Possible-Tech-Projects , Outreach-Programs-Projects , MediaWiki-extension-requests , Technical-Tool-Request and update/correct if needed, once changes have been performed.