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First of all, I can enable the "checking your browser" thing, and that stops almost all attacker traffic. But that also breaks noscript browsers and bots, so I don't like to do it too much. Skilled attackers can also sometimes get through that, though I think that it does require a proof-of-work.
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Checking your browser is still on, but it's not a problem for me.
The interesting part in your answer is the following:
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But that also breaks noscript browsers and bots
So theoretically it can stop bots, who spam nonsense posts forumwide? Does this work in practice as well?
Or those bots are not that kind of bots?
If noscript browser means e.g. tor browser, than I can understand that you don't like to use this checking your browser a lot, just when it's absolutely necessary.