While that may be, I was unaware that this Schnorr signature feature was a part of The SegWit Omnibus Changeset. Last I heard, the devs concluded 'expect BIP within next year or so'. No?
As I said , it is a prerequisite to allow for Schnorr signatures. Thus a very small
temporary increase in bandwidth and storage will allow us great savings later.
At his point in time, I am unaware of anyone reporting the quadratic cost in signature hashing as being a significant issue other than the one party who intentionally created a single-transaction maxblocksize block to perform an experiment that ended up as nothing but fodder for concern-trolling.
It effects us all right now , and while few people currently have nodes crashing currently due to maxBlockSize being limited to 1MB , the whole point of segwit is to be forward looking to increase scalability. Have you read the LN roadmap or cores roadmap with flexcap? Core's plan is increasing capacity with larger blocks in the future. It is only rational to make bitcoin more scalable before or while you increase capacity. In this case segwit rolls in protection within the same capacity upgrade.
Either way, there are other solutions to this issue. I think the free market would solve this on its own. What incentive does a miner have to continue hashing on a block that it knows is going to take multiple block intervals to hash? The miners' own self-interest would cause them to orphan that block and get back to hashing. Whatever - that's peripheral to the proximate discussion.
Sure some miners may restrict certain Tx's , others will not and this will cause havoc with nodes.
and thereby through this mechanism increases decentralization. Which is demonstrably false.
Both proposals will likely decrease full node count and do little to change the somewhat more centralized nature of mining. Ignoring all of the unrelated benefits of Segwit, it has the benefit to bandwidth, and storage costs in the future , and protect against the more important concern of UTXO bloat and quadratic cost in signature hashing right now.
You aren't considering the extreme danger this presents when the blocksize is increased. Additionally, Segwit allows SPV nodes to run more secure in the future (fraud proofs) and lower bandwidth immediately. Additionally, because
Segwit opens the door for the LN sooner than Classic by fixing tx Malleability we can finally incentivize nodes and increase decentralized node count.