They don't make the network less efficient. They just increase the fees. That's expected to happen either way sooner or later to sustain the miners' income.
in correct
deflationary market spot price moves up by more then 2x when rewards half.. so the spot market takes care of things not fee's
also bitcoin should allow more transactions so individuals pay less but the total combined tx's give a nice BONUS to mining pools
Ordinals are not an addition to Bitcoin Core. People just take advantage of Bitcoin allowing arbitrary data being embedded in transactions.
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What kind of justification would be sufficient to you? They are valid transactions, and therefore are allowed by the protocol.
with the exploits core added and were warned about when they added it, which allow junk UNCHECKED to be included. the junk is not a valid transaction. the junk does not even go through any validity checks they just get treated as 'assumevalid' which bypasses validity checks of the bytes of data. which is different than actual validity checked transaction data.. its a softening of the rules to let things in unchecked. thus an exploit not a feature