We do. its called Electrum.
Huh, did you were here a couple days ago? All SPV wallets suffered from a high risk of non valid transactions due the blockchain split, and guess what, Electrum is a SPV wallet. Basically any wallet that wasn't an updated core wallet was under risk.
You: We need non-full clients.
Me: There are some.
You: But they aren't full clients.
SPV wallets can't be fully trusted as seen 2 days ago.
never bothered with those lighwallet, i know they can be good for newcomers who do not want to dl 40 giga or something, but even with a 8mega connection, it isn't a pain in the ass to download the whole chain...
everything is 40 giga nowadays, game movie, we are not in 2005 anymore....
However, for most of the time and especially smaller payments, SPV works great.
i still think that miners should only use core for their mining activity
It's not only the download time (which is slow af even if you have a good connection, because sometimes the client is just slow at getting peers) it's also slow at processing the blockchain if you don't have a legit good computer. It takes way too much memory.
BTC without lightweight clients taht you can trust = will never be a success. BTW, it seems it still happening:
https://bitcoin.org/en/alert/2015-07-04-spv-mining
We need all of this solved before mainstream takes over