HoyaLawya said:
From a deck diversity standpoint I would say it's not a good idea to make common agendas restricted. The main purpose of the agendas are to add diversity to the decks so that you have multiple builds out of each house with different agendas. Placing agendas on the restricted list discourages people from playing them. Fewer played agendas results in more vanilla just pick the best in house and neutral cards type decks.
I have to disagree, many times that I have build a deck and it is close to finish I take a look on what could make it more powerful than it already is. The answer to this usually is summer/winter. With Samwell I get better draw than what my house might have, the house usually has good season effects of its own and most importantly the agenda drawbacks are too small for the gain they have. So I cannot speak for everyone, but the season agendas have restricted my deckbuilding a lot thanks for the fact that they add so much with fairly little effort, but they do need atleast 8 card slots from my deck and often more. Now if the agendas would be restricted I would still run seasons in some decks yes, but it would not be so easy choice as it is currently is to just add season to a deck to make it better.