Tx size has nothing to do with it. Blocksize is the main issue.
Bitcoin blocksize is fixed. So increased demand means rising fees.
Monero blockspace changes based on demand. More demand means blockspace grows to accomadate it AKA very cheap tx fees even if it had the same traffic as Bitcoin.
No, the main issue is the validation. Monero txs are larger and take more space. That means they're more expensive and harder to validate. That means less users are validating, and that means less security.
You are wrong. The issue is block size. In btc people have to outbid others for limited space in a block, which drives up the price. In xmr the block size will adjust to accommodate the demand.
You're wrong. When talking about scaling, the issue is validation. In Monero, people cannot run the nodes so they'd need to trust centralized entities for validation, that's much bigger problem than higher tx fees.
