The surest way to get flamed out of any crypto mailing list was to ask what the effective clearance rate for the coin was, then following it up with how it could be sped up.

Today the bitcoin network is still stuck at ~7 transactions a second.

This is not what the white paper promised.

Thus, other blockchains emerged

Yes, we only need checks notes 3,500 other coins to match the clearance rate of Visa.

And adding more confusion and more problems.

Btw. Criss chain transaction is the major problem this strategy added.

requiring much higher resources to run a node and making them much less decentralized.

Which one are you referring to? What do you want to get all the freedom in the world and no effort for running a decentralized node? Staking blockchains don't require much resources.

The ones that allow hundreds of txs per second, making verification of the entire tx history orders of magnitude harder. The limited tx throughput of bitcoin is a feature, not a bug.