Why There is Never a change in system in any updates

Every time any updates comes any changes are about champions and skins. why there is no changes or upcoming changes about matchmaking system or ban system ? why never a single rioter say we are working on making a little more accurate matchamking system and a little more better Ban system . Why never there is a change to have better community or better games. am i crazy and its ok that riot thinks the system is actually Fine or u think like me too ?