Algo trading is the new buzzword for retail traders. Like "AI-xyz" or back in the day "TA".
It is so broad a term that is easily becomes meaningless. If one were to catalog the types of Algo trading it would be VERY large, despite the secrecy behind it. Just like TA.
Algos are just an extension of TA. Although it is faster, and can eliminate human intervention for order execution. The big difference is people like to conflate order execution and signal generation to make it even more a "silver bullet". This is oversimplifying the situation.
So it is no more or no less "feasible" in the broad sense than, say TA. It is just another tool and how you use it, how precisely, how accurately, how you maintain it for changing markets, makes the difference between success and churning or even failure.
Bottom line, it still takes SKILL.