Its not just mehadrin vs rabbanut issue?
1) No.*
2) Even if yes, this is something you foreigners have got to learn: regular Rabbanut is
not "just another hechsher, except not as amazing"; it is almost completely
worthless for anything more complicated than a cup of coffee (unless, of course, you personally research the establishment and/or ascertain from other sources that the mashgiach can be trusted, etc.) But just walking into a restaurant and seeing a certificate with some aleph-bais on it doesn't automagically make the place kosher. For meat especially, most people do not rely on regular Rabbanut, as they rely on certain kulos in the shechitah process that would make your head spin.
*
Side note: there was a story going around about some guys who asked the owner of Dex what the hashgacha was. His response was "if you care enough to actually ask that question, then this place is probably not for you."