Earlier quoted context omitted.
Those package dependency graphs are there to protect you. Having to route around the protection is precisely why you should use a package manger properly - to ensure you don't end up with incompatible/borked installation of key elements. No, I do not think Installers are better than package management. By far, package managers are a key factor in system stability.
Here's a better idea: build the system such that dependency conflicts aren't possible. This is trivial by having a stable base system and otherwise including any application's dependencies in the same directory as the application, which of course means not spreading the application all over the file tree (and thus avoiding another non-existent problem that package managers solve). I know, that's really hard for Linux…
I prefer to just keep the system stable through careful application of well-curated dependency graphs. I've never run into any issue, having used Linux since the very first day, that I couldn't solve by proper application of package manager tools. It seems its easy for newbies and those who don't care enough to get into trouble, but with the right attitude you can easily have systems with years and years of uptime (personal experience).