Do you think there's a single change the devs could make that people wouldn't complain about?

There will always be people who complain. That is not what should be focused on. Focus on whether the changes are well thought out and vetted. Therein lies the problem with this dev team. Changes are rarely well thought out and often make matters worse.

I should be careful here. The last time I laid out a well thought out critique of the developer's lack of quality control process, the mods shut down the thread saying we can't criticize the devs on their forums. Pathetic, but true.

Ignore people complaining and look to find those who have legitimate concerns about changes. This dev team is infamous for not taking the ripple affect of their changes into consideration.

Make a cool new micro event of sorts where the first week of each month grants players 100% increase bloodpoints and 50% xp bonuses.

Also increase pyramid head's ass size.

Perk presets

Search bar for perks

Better lightning and reduced shadows on all maps

hide behind obstacles, like long walls?

Do you think there will ever be a single change that the devs would make to favor killers than survivor?

Probably not because everyone has different opinions. There's always gonna be positive and negative reactions.