This add-on is not what you need. Some people have different needs than you.

I, for example, need a list of custom queries on the same website. Just a few parameters of the query are different. Also I need to quickly add or modify these search queries.
I your opinion, I should go on Mycroft and create about 20 plugins, all mostly identical. Then download them. Then every few days add a new plugin there or modify one of my plugins? So which solution is friendlier for the people with the same needs as me? This add-on or Mycroft?

Your review is like someone rating negatively all the trucks because he doesn't need a truck.

Edit: If really there is no add-on using the Mycroft plugins then I could create a separate add-on to use them.