They design the car around the tyres and changing them affected the pecking order because they can't redesign them overnight. The other 9 teams are not managing it, drivers from all teams have complained.That's a poor example, tyres are identical for everybody. The teams don't design the tyres it's outside of their control, the complete opposite of the porpoising situation.
And if it is health and safety you are so worried about then get Mercedes to change their car/set up. The 9 other teams are managing it, yet the rules need to change mid-season? For one team who refuses to take responsibility for how THEY are pushing their own drivers' health?
Sorry but the rules are the same for everyone, Mercedes only care about performance and are using the excuse of health to try and keep some semblance of performance.
I have no issue with new rules regarding this for next season, but to change it mid-season for one team? You can see why the other team principles are not happy.