As far as i know, the Interfaces in go have

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As far as i know, the Interfaces in go have

bad effect on performance (as mentioned here)

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Method calls on interface types are a dynamic dispatch — the actual concrete implementation to use is only determinable at runtime. Consider a variable r with an interface type of io.Reader. A call to r.Read(b) will cause both the value of r and the backing array of the byte slice b to escape and therefore be allocated on the heap.
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So what we can do? Without using the interface, we can't even test our code as well and our design get overcomplicated.