The reason that it isn't silly is that people keep saying these larger sizes are necessary when anyone with some perspective and history in computers knows that it's ridiculous.
You can say users don't care about bloat and speed, but when they have an alternative that is clearly not the case. uTorrent destroyed the market share of other torrent clients by being lightning fast and tiny. Chrome captured market share off of being fast. IE originally killed Netscape because it 'loaded' much faster. Winamp won because it was fast and tiny. Google won because it loaded fast and the searches were fast. Google maps won because it was full screen and still faster than MapQuest. People hate the Reddit redesign because it is slow and bloated. People like hacker news' interface because it is fast. People upgrade their phones to see dramatic speed differences. A major advantage of apple is their faster CPUs.
When users have no choice, they put up with whatever bloated nonsense they have to. When they have a choice, they do actually go with interactivity and less latency.
You can be patronizing and pretend that it's archaic to care about well made software that doesn't take up 100x the resources it should need, but when someone wants software that gets out of their way, scales well, or runs on a low power platform, that 300 MB chat client isn't going to cut it.