If you generated a truly interesting discussion around the pros and cons of having a bruiser-specific tree, you'd be much more likely to attract Rioter attention.
It's really hard for them to respond to requests like this for a couple of reasons.
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Riot isn't a person. There are likely people at Riot who would very much like to see that, and there are likely others that think it's a bad idea. Answering this question in a way that respects both the playerbase and their fellow Rioters takes quite a bit of effort. They have to be careful with that.
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"Runepath for bruisers" is incredibly vague. I would argue that they already have several paths for bruisers; if you're asking for one that is specifically tailored to only bruisers, what does that path look like? Many people likely disagree on that point, as well, so even if a Rioter were to tell you "yes," and they brought it out a few months later, you might be disappointed with the result.
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If they did respond to questions like this, it would become pretty common for people to keep asking Riot direct questions, and pretty soon the Boards would be a Q&A that actively distracted from Rioters getting their work done.
So, with all of that in mind, let's actually discuss the issue. What do you want to see in a bruiser-specific path that is unique? What's missing for Bruisers in the current Rune system that you think would make the game more fun and/or healthy for bruisers and opponents of bruisers? Are there enough interesting ideas for bruisers that could support an entirely new tree?