That is exactly right. IMO, if you are responding and contributing into the discussion, that is not considered as a spam, not unless you jump from topic-to-topic writing whatever comes into your mind without a care just to compose/construct sentences to reach the minimum words of 150 is most probably considered a burst posting. Just like you do too, I am also someone who can keep up with several subjects at the same time, maybe it is called multi-tasking or so, but regardless of that, it is something that needs constant practice and requires you to voluntarily control your focus so that you won't mixed up all your replies.
That's right. That's why if a topic is too many replies to the OP or too many replies after my post, we have to spend more time to understand the point of the conversation. That way I'll be able to see if I have something to add or not to the subject.
Of course, sometimes, we can repeat one or another information that has already been said, but if we are original and genuine, we will certainly present that same information from another point of view that can help the debate.
To be honest, it is really hard to construct short and precise message or words without repeating some information presented while adding the fact that there are minimum numbers of character and words that is required for you to become a valid poster that isn't only good at adding flowery words. As I've said that it requires constant practice to voluntarily control your focus since those things cannot be achieved by being a nonchalant poster alone. We should also keep in mind that what we replied is something not only straight to the point but also relevant to the topic and also for others to engage with it or even a new knowledge you can add to it. Although this is irrelevant, this is mostly why in my free time I usually read books even fictional novels to expand my vocabulary and to increase knowledge about constructing sentences, coz whether I like it or not and even if English is our international language, I am not born from a native English-speaking country, so if I wanted to converse with anyone using general language which is English, I still needed to become more comprehensive. Replying isn't all about speaking English alone but also understanding the context of what you really are replying to, so far that's what I've learned here from staying on this platform.