The most important benefit of difficult amendment process is giving the Constitution higher value and to refrain corrupt politicians and political groups from using is for their own gain and agendas. If the amendment process would be very easy to pass, everyone can easily change it and would lower its value.
A political party would notify people about certain issues for many reasons, one of them (where they would then want to gain interest and support of the public) would that they want to gain political points so they could ensure being re-election.
