How does ios 6.1 help an iPhone 4?

I just read what the details of the updates are and I don't see how it makes use of 1gb of space. I don't have Siri. And I don't use iTunes Match.Am I missing a reason to want this update?

I have NOT read the article but common sense tells you that if the phone does NOT have the hardware how can it benefit from the software
Did not the IP3 GS also have an IOS 6.0 update?

It may be more of a marketing strategy as to buy the IP4 is a waste of money as IP4 will be discontinued this year 2013!

When the iPhone 5 was released the IP 3GS was dropped on 12/09/2012.
Later this year the IP6 /IP5S whatever it is named is released the IP4 IS DISCONTINUED.
APPLE ONLY SUPPORTS the last 3 Iphones.

This phone is pushing 3 years old and appeals to people who now think even new at last an affordable iPhone. Wow Apple branding so anybody signing a contract now will be using a 8Gb phone that end in 2015, 5 years after it was release

in 2012 original owner are upgrading from the IP4 retrograde purchase buying now will have a phone in 2015 that is an entry level phone