Fixing this is possible, but only if you are experienced, and have set aside enough prep time ahead of play. Calling the effort involved "trivial" is detached from reality.
		
		
	 
Being a good DM at any Tier isn’t trivial, but modifying difficulty from the DMG baseline to match your players is a trivial increase in the prep time and experience already required to be a DM.  Players trounce a combat?  Note the encounter XP and increase it 10% for the next encounter. Repeat until satisfied with the results. Same with max CR. Start at character level and increase by 10% until happy. I’ve found that my group, given their skill, character build choices and magic items can handle monster CR about 150% of their level. 
	
		
	
	
		
		
			The way you claim to speak for everybody utterly trivializing death is not only not appreciated, it also speaks volumes itself.
		
		
	 
What does it speak volumes about? The rules of the game make resurrection easy and common at Tier IV; surely you don’t dispute that.  That’s why character survival isn’t what I focus on to provide challenge, but rather accomplishing goals. Players can be resurrected, but they can still fail. 
If you don’t like death in your game, follow the DMG encounter guidelines and your players should have no problem avoiding it.  If you want challenge, that means death will sometimes occur.  Without actual failure you don’t have real challenge, just the appearance of it. 
 [MENTION=6688277]Sadras[/MENTION] I am not a game designer, I work in movie marketing with a background in film and television production.  I run a game every other week for 5 hours for a group that I would consider casual gamers and, when I’m lucky, play another 1-2 sessions a month.  On average I prep 2-4 hours for a session, which has decreased over the 4 years I’ve run the campaign as I’ve gotten better as a DM even as the campaign level has increased. 
I’ve had 2 permanent PC deaths in 4 years, both during an epic BBEG battle at the end of Tier III, and two death/resurrections in Tier IV after 15 sessions.  In every case those deaths meant the PCs accomplishing their goal at the time.