You're absolutely right, my friend. In theory, it is possible to conduct transactions using just a Lightning wallet on a business owner's phone and a customer's phone, without the need for a point of sale system or any other intermediary.

In fact, this is one of the key benefits of Lightning Network - it allows for fast, cheap, and decentralized transactions that can be carried out directly between two parties without the need for a middleman.

However, in practice, there may be some challenges to implementing this kind of system, particularly in regions where government regulations around cryptocurrency and financial transactions are complex or burdensome. Additionally, some businesses may prefer to use more traditional forms of payment processing out of familiarity or preference.

That being said, the potential benefits of using Lightning Network for decentralized, peer-to-peer transactions are significant, and I believe we will continue to see more and more businesses and individuals adopting this technology in the years ahead. Ultimately, the decision of whether or not to run a node or utilize Lightning technology as a business owner will depend on a variety of factors, including personal preference, market demand, and regulatory factors.