It's more so "we don't do it because it wouldn't help much and would require much more moderation". I ask for new boards whenever I see a single, specific type of thread dominating the board (e.g. Bounties(Altcoins) or possibly tokens), not a collection of loose, minor or trend-specific characteristics. If I were to ask for new boards (which I probably will in the near future), I'd have to make sure they wouldn't just sit empty after a trend passes.
I fully disagree with that statement. Whilst the suggestion(s) by OP may or may not be optimal, there is a clear distinction between classic altcoins and ICOs/pre-sales/et. al. and there's a lot o both. That section is suffering greatly due to the flood of both, and a separation would be extremely beneficial.1) Miners.
2) Investors.
Group 1 will be looking for altcoins that can be mined, and this is very rarely the case with ICOs et. al. Such a user has to waste a lot of time in that section trying to find such. Group 2 would be looking for potential new ICOs/projects that they can invest in. They have to waste a lot of time avoiding standard alts. There are a lot of both: 1) Altcoins (as in the old days). 2) Token sales, that would justify a separation.