The slippery slope fallacy serves mostly as an argument against logic
I'm not stating the slippery slope fallacy doesn't exist. I'm stating it is often used as a tactic against valid arguments.
Example : If a government changes its constitution, it's very likely to lead to some sort of fascist state, because the constitution is what protects the weak from the strong. Therefore, changing anything about the constitution is inherently dangerous and we shouldn't do such things with no concrete plan and solid reasoning.
This is a valid argument. Contracts aren't modified after they have been signed like it's nothing and neither should a constitution. It would be a fallacy if it was absolute. If I were to say "Changing anything about the constitution leads to fascism therefore anyone that tries to touch it is a fascist" yeah throw your stones at me no problem. But as it is, it is a valid argument, and those kinds of arguments often get dismissed because they very obviously use the slippery slope logical argument.
The slippery slope logical argument is a fundation of logic itself : If a, then b, if b, then c, therefore if a, then c. While it may not be that simple in more complex fields, dismissing it as a fallacy without being able to point out why it doesn't work is simply going against logic. It may not work because there is a false equivalence, because b is actually a fake news, or because past experience proves that b does not tend to lead to c, but as it is, it is a logical and sound argument and unless you're able to properly tear it down you better not throw the term fallacy around like it's the ultimate answer to things you disagree with.