I am perfectly happy with my .308 8-rounders, but if 20 rounders are available, then sure I'll take some. It's freedom of choice, not because I need them, but I'd like to have them. If the case is being made that high-cap aren't necessary, then being restricted to 10 rounds on all our firearms should be no big deal.
The way I see it, if you can have more, then why not.
Do people need a car that does over 85, or do people need a million dollar house, or do women need 100 pairs of shoes? Probably not, but it's their right.
If I'm allowed to have high-caps, then I will exercise that