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Will this Ethereum transaction fee be reduced from this point ?
Just remember what happened to the gas fee when the ethereum blockchain was clogged due to cryptokitties. You can look for articles written on that if you're not yet aware.
Will from this point you experience a loss created ?
If there really is a loss, can you name it ?
What?
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I don't really understand how POS works because maybe I didn't learn much about the various types of POS coins.
You think that POS is the best breakthrough for Ethereum, right?
Can you provide relevant information that proves that EThereum will improve its performance with POS type?
POS isn't something new that you can call it the "best breakthrough"
There are plenty of articles that discusses what to expect from ethereum 2.0 but don't expect for real proof because those are still speculations. Tests are being done but you will never really know until they've migrated to POS.
A few days ago, Buterin talked about plans to implement improvements to Ethereum 2.0 and said that the team is now working on the release of Phase 0, which will unveil the stake proof network, after which Ethereum 2.0 will begin as an independent POS network. This will allow, instead of processing all network transactions, each node to process transactions only for a specific segment. This, in turn, can provide the ethereum scaling issue without compromising network security. Buterin also said that this is not the only way to solve the problem of scaling ethereum. Therefore, for ethereum and its users, this improvement will be a great event.