Everything is a trade-off.
Sure, so what's the trade-off for allowing micropayments and reddit's tipping on the primary chain?
Bitcoin is ideal for that if you use payment channels. I'm not sure why they aren't doing that right now.
Because micro-channels are only for
recurring micro-payments that can be aggregated to a bigger one later. It's a small subset of micro-payments, certainly not the general case.
Now if you'd please answer the original question.