There is a debate in selecting the smoothign constant in Single Exponentioan Smoothing method by practitioner or considering it as a process parameter?
Could you please provide your opinion regarding this issue?
I am unaware of any expert recommending that users choose their own smoothing constant. The consensus, as far as I understand it, is to optimize it in some way. See, e.g., here.
Of course, older software may require the user to set the constant himself, but this is not supported by evidence and probably due to the software development process and the constraints it faces.