What? I've never, ever seen Hangouts pull in old texts, just Hangouts messages. Nor have I ever heard about that being a feature. And I've wanted SMS backup/syncing for a long time. I use SMS Backup & Restore to do it manually.
Are you saying this is a new thing in L, or...? Or that it's a new Hangouts feature? I would love it to be true, but I've never seen it.
After further review, unfortunately, you are right.
I was basing it off my logged covos with my sisters. :=[
They seem to flip-flop between sending text to my GV#, Mobile# and, hangouts.
So reading through the convo they are some gaps. Any MMS sent to my GV# are still there, which is what confused me. These were sent way before Google announced the MMS support on GV. The answer as to why I was getting these before the support was announced is that both of them are on Sprint.
That being said, I don't see why Google couldn't back up your sms messages up to the cloud via Hangouts going forward.
This is the way your notification bar and nav bar look like when you activate the battery saver mode:
Some of the animations are gone when this is activated.
Is the "Contacts" app the new version of the "People App"?
If so, there is no more Google+ integration, at all. No info on people you have on the network. Which simplifies your contacts.