Brainstorming: On chain decentralized exchange possible on Bitcoin Blockchain?

[Wind_FURY]

If I run a "sharding-node", do I trust the other "sharding-nodes" of the other shard, instead of the consensus itself?

Sharding node still verify all block header belongs to another shard.

Like Electrum light wallets? Not like full nodes?

Would it be considered sharding if the miners are required to have all the blocks?

I have yet to research about mining on sharding blockchain, but blockchain which uses blockchain still have a type of node which store and verify all shard.

I believe some developers are into something again, with promises of on-chain scaling of a decentralized network, with low/no fees/cost to the network through "sharding". They will sell it as scaling-out, when in fact it scales the network in.

There WILL be centralization with more efficiency. No one can bend the laws of Physics.

[BrewMaster]

PS: In the blockchair I could not find any data which shows fees analysis. Which corner it is hiding?

sorry for late response. it is a bit hidden under their charts link that can be found at the bottom of the page. or use the link by adding the coin name and the word charts like this (/coinnamse/charts) to get it for each coin. here is the direct link for ETH fee charts:
https://blockchair.com/ethereum/charts/average-transaction-fee-eth

[Wind_FURY]

Like Electrum light wallets? Not like full nodes?

AFAIK it's closer to Electrum SPV

Which SPVs are not actually part of the network, actually trusts the nodes they are connected to. Are "sharded cryptocurrency networks" more open to Sybil Attacks?

I believe all the added complications, and risks, for the same benefit that can be developed in off-chain layered networks.