Contrary to popular belief that bots are just an automated version of manual trading strategy, it’s correct but not entirely right. There are many manual strategies that can not be automated and there are many automated trading systems that can not be done manually (e.g. Arbitrage, etc.). It is also a misconception that running a bot eliminates the psychological aspect of trading. At some points, it affects the traders psychologically when traders monitors the performance of the bot and at some point intervene the execution like closing open trades due to doubts and other emotions.
Opinions of traders about profitability, automated or manual, depend on their length of experience and depend on what they have experienced. IMHO, a bot can be profitable consistently. That is based on my experience.