But that ideal is almost impossible to reach, so in my opinion at most a bot should give signals, but it should not have the feature of trading by itself, this way the trader can always double check that everything is in order and only then conduct a trade on the exchange of their preference.
It depends on the trade. A lot of strategies can be automated, off the top of my head I can mention stop loss orders that need to be executed automatically and from trading strategies I can think of Arbitrage Trading which has to be fully automated to work efficiently and fast. In fact arbitrage is not something you can do manually and make profit.