The beacon game is largley the end game for long term Stormfall players.
When you start the game you are focused on the immediate of building up your castles and your lost arts. Maybe you get into a bit of castle warfare, which is largely 1 on 1 (although multiple ppl can defend).
As you move to being a medium/long term player you start completing these objective and your attention turns to wider goals and objectives that can only be achieved in co-operation with other people. These objectives are much more difficult to achieve and open up another level of game play that can absorb and interest you into the medium and long term.
Largely in Stormfall that is the raising and holding beacons and looking to progress your leagues rank. This requires multi-person co-operation, a whole league. It's where the true MMO elements of the game come alive.
The beacon game largely drives the meta game. Nearly all the diplo, spying, meetings, allies, colalitions etc are driven by the beacon game. It's essential to driving the real richness of the MMO element of the game. This is where the rich tapestries of player interactions, huge server wars and more are written. Where the game comes alive from it's simple algo's that calculate raid and seige mechanics, or BG fights, to something that has a life, and write a unique story, of it's own.
Without the beacon game the game holds no content for the majority of people as they progress into the medium and long term and the game won't retain them. There are no wider goals to progress into and keep people interested.
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Only a CM can tell you if the above (issue 1 and 2) mirrors Plarium's reasons for bringing beacon force limits to Stormfall. One assumes it is, and they fully understood the issues the players brought to them at the back end of 2018.
I can tell you the above are the reasons the Stormfall players united and came to the forums en mass to ask for force limits in Stormfall. I know this because I was one of the players that organised the TS meetings for players from across the game to come together and discuss the problem and formulate a request to put to Plarium to fix things. I also drafted the forum posts to summarise the players ideas, that were then reviewed and approved by everyone.