>If plan is ok for one value parameters, then can be pretty bad for following 

Happy statements are all alike; every unhappy statement is unhappy in
its own way (see [1]).
If user is sending different kinds of parameters, he is shooting in the foot.

>Albe's proposal can be good enough for 2/3 cases and it doesn't block any 
>other enhancing

Albe's proposal effectively disables plan cache, thus it blocks enhancing.
If a user goes "replan every time" route, there is no way you
introduce plan caching there.

[1]: https://en.wikipedia.org/wiki/Anna_Karenina_principle


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