I don't see infinites really mattering much. It's easy to knock off 3/4 life by using a fairly simple combo and one bar with most characters. Infinite gives you... a full bar, at the price of giving your opponent a full bar in the process, and is probably tougher to do than the simple 3/4 life comboes (which people already drop all the time).
But yeah it's sloppy. Bad in principle, but not going to change how many matches go I don't think.
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