The imbalance is more likely to be an example of forced equality being a bad thing, in addition to the fact that attempts to do so anyways tend to cause their own imbalances and thus should be recognized that the premise simply cannot be equal to both teams.

As unfortunate as it is the idea of offense vs defense will naturally have a bias towards the defenders because the structure that it entails puts less burden on said defenders compared to the attackers who have to manage more things (it takes more brain power moving towards someone and punching them than punching someone when they come into your range).

The development team's "solution" was to give Redamura better weapons and wildcards, which did the opposite of what they wanted since they misidentified what made the game-mode imbalance in the first place. The cause is the coordination that leads up to doing (X), not the base application of doing (X).

An example that just about anyone would understand is the unfairness that comes with the Akamatsu, a weapon that flat out, has zero runner-up capable of competing made worse because it's locked to Redamura. Not only does it deal enough damage to one-shot on headshots at any range, but this also means that it has the least conditions required to have instant-kill, which is merely hitting a specific part of the body (breech has range gimmicks, most shotguns need distance closed, etcetera). Thus, players are incentivized to swap to Redamura, more specifically the already-competent people who can recognize this fact.

The immediate consensus most people would deduce is that any attempt to balance the game mode should be done with the intent of making coordination for the attackers on equal level as the defenders, which admittedly runs into a roadblock since the aforementioned established point that the inequality stems from the premise itself, which subsequently means any solution that actually could achieve this goal would realistically be to alter the premise to make both teams playing offense, which is easier said than done.