While it’s easy to be full of angst there are some things to keep in mind:
The Als have had the toughest opening schedule: Opponents are 10-5. Edmonton , with the best record, has faced opponents with 6-8.
Whyte is second in punting
Whitaker is second in rushing
Taylor is second in combined yards
Bowman is tied for most sacks.
They have a coach who has won COY awards. Grey Cup winner. Some say he’s been away too long but others may say he’s ben closely involved with all teams during that time as director of officiating. About the same age as Trestman. Not a ducker or diver.
Their best receiver has been missing and will be a huge upgrade.
IMO the main problems boil down to:
Poor QB play from an unproven player: This is the key one and is the one to focus on. I do not see this as primarily a coaching issue.
Poor infusion of new talent: GM responsibility
Too much blitzing: Need coaching tweaks
Too may penalties: Coaching responsibility. May need to cut a player to signify seriousness.
I do not see the need at all to fire coaches or to overly criticize the play calling. To focus on these will avoid main issues imo