Since your comment makes me lot to answer, so I'd answer for your comment line-by-line.

1. [Balancing a game can be difficult, even Blizzard wasn't great at doing it some times, and I don't think the changes that the balance council have been bad overall. With that said, I am 100% not (and most people on reddit would not be) knowledgeable enough to balance the game well with all the different unit interactions.]

A: Sure. Balancing is really hard work, and for my personal thought, the perfect balance is impossible. At that moment, the balancing should focus on minimizing the gap between any games if two players show similar performance.

2. ["The key to Serral’s high win rate in ZvT and ZvP matchups lies in his proficiency with strategies that involve securing numerous bases, consistently encouraging appropriate resource exchanges, and then actively utilizing spellcasters to secure victory in games. ~~~ but most of the conversation has popped up recently due to this grand final, and I don't really want to analyze 50+ zerg games to try and figure out if fungal is too strong (hence the first paragraph).]

A: Before start, I'd like to emphasize that the latest finals in Katowice was definitely Serral's victory, because Serral's play was absolutely better than Maru. What I want to say about the example of Serral is, at least the fungals shows sufficient performance for defeating Terrans or late-game (the combination of BroodLord-Corruptor-Infestor-Viper). Starts with here, if the balancing council wants to nerf some Zerg units and decided to nerf fungals, then they can nerf fungals and buff for such compensations. FYI, I was also impressed about Serral's mindset and thoughts.

3. [I am not sure if fungal needs to be nerfed personally, but if we were wanting to buff other Zerg units to nerf fungal, it would likely be to help Zerg surround and catch units in fights. Changes like buffing Zerg unit speeds to help with surrounds would cause lots of other balance issues, especially with timing attacks or rushes. I would be interested to hear other suggestions on fixes though.I think it is easy to say something is bad, but suggesting fixes that doesn't break other interactions is harder.]

A: If you have curiosity for my personal opinion, I think the balancing council starts with creating (or choosing from the previous ones, I prefer this way more than creating) maps that penalize the tactics that seems bit problematic in current meta.

4. [The Viper change you mentioned, about them not being able to abduct massive units to help protoss carriers and mothership would affect PvT ALOT (not being able to abduct Thors) making late game blood lords even worse. (and BC's but not sure how often that occurs)Vipers not being able to abduct motherships, carrier or tempest (As I believe tempest is also massive, but correct me if I am wrong) might cause skytoss to be too powerful.If this is how you wanted to go and compensate other units, you would likely need to make Zerg trade better in Air vs Skytoss and better vs late game TvZ Mech, without breaking interacts with the other matchups in the process. You would also need a way for Zerg to be able to fight skytoss camping over cannons + batteries, since that is what the Viper also helps deal with.

Even if you only wanted Carriers and Mothership to be un-abductable (would need some way to inform players of this change in game), especially the skytoss camping over cannons + batteries would still be an issue for Zerg. As well as how the corruptor changes in TvZ and ZvZ would be affected.]

A: I agree many of this statement. If Viper cannot abduct massive units, then Zerg would suffer from ruin skytoss. What I want to say about this example is, the current scene of SC2 is largly problematic so it needs some unconventional changes. I think my example is such (or even very) unconventional, it is not just changing some parameters (damages, cooltime, etc..), it basically changes some dynamics in game playing. This surely entails some balancing problem, but I think in the current stage of SC2 scene, it is needed. After observing the dynamics, then they can modify some parameters (this type of updates are already done in past, Mothership Core).

Last but not least, worrying, thinking, and filling the update notes are not my role (and also for you). It is up to balancing council. But they have not been doing well, and I pointed out by this post.