Node count doesn’t matter at all in terms of transaction volume. Do you understand how blockspace works? Honest question. There’s no need to speculate - it’s very easy to understand the maximum limit for on-chain transactions on both Bitcoin and Litecoin. Neither of them are even close to being able to service all global transactions on-chain.

There were 153 transactions in the lates Litecoin block - blocks aren’t even close to full and the mempool is cleared. Meanwhile Bitcoin had 3,484 transactions in its latest block and has over 200,000 pending in mempool. Do you see the difference?