Promoting from Championship to PL is huge , money wise
They just want to make it more dramatic , play-off final at Wembley ...then promoting to PL..the drama ..broadcast revenue.. etc..
In Germany it is little bit different , 17th & 18th will get relegated ( Total of 18 Teams only ) ...the 16th placed in Tier 1 to play a 'relegation play-off' with third placed team in Tier 2