I'm not sure how it works with Phoenix 2021 but Latics have never previously owned the stadium - a stadium company does & (as far as I'm aware) Wigan RL pay the same % of their gate receipts in rent as Latics do
Whilst the stadium company has always previously been 85% owned by the same company that owns 100% of Latics, It's therefore in the stadium company's interest to get as many Wigan RL fans through the turnstiles as possible - one way of doing that is to make it feel as much like their home to them as it does to Latics fans (which it is at the end of the day).
You make them feel unwanted & unwelcome & less of them will turn up which means that the stadium company (owned by the same people that own Latics) makes less money which means less can be invested in to Latics by the owners of that holding company
Other than that, it's not a bad idea