What is the process for extending a tourist visa in Thailand for British citizens, and what are the alternatives?

A British citizen recently reported the approval of their Digital Nomad Visa (DTV) application within just a few days after submission in Hanoi. The post sparked a discussion on the different types of visas applicable for long-term stays in Thailand, such as the tourist visa and the Non-O visa, and their respective extension processes. Comments covered the benefits and drawbacks of the 60-day tourist visa and the ability to apply for extensions at immigration offices. Various views were presented on the costs and procedures associated with visa runs and staying legally in Thailand. Overall, the conversation highlighted the complexities of securing and extending visas as an expat in Thailand.