Making various transactions, either for goods or services is part of the activities of individuals and households. Obviously the utilization of the flexibility of Bitcoin for these transactions is on the rise, but something we're yet to experience, is using Bitcoin for micro transactions; gaming, online tipping, unlock assets of content creation, just to mention a few. For flat currencies, smaller units of the currencies may be in short supply to make such transactions. Households and individuals will surely be jumping at the prospect of the option of Bitcoin for these nature of transactions.
If people started using bitcoin for micro payments, then I am sure the mempool will just clog and make it expensive, so you will be paying $12 fee for $7 coffee which makes it bitcoin is not suitable for micropayments but with LN it is possible to an extent but I am not sure that everyone like a mother or grandpa will go through all the hassle of creating a channel and maintain the liquidity unless they were forced to do.
Bitcoin is suitable for bigger transactions, something that is huge and makes it perfect to act on our own with no third party to decide what we should do.