While I agree that monopolies suck, I _absolutely hate_ having to waste my time adjusting styles and writing workaround code just to make everything look and work consistently in a multitude of browsers. This is one of the reasons — among a hundred others — that I grew to somewhat hate front-end, doubly so with the rise of mobile devices. And the more rendering engines we have, the more developers will have to fight frustrating battles with inconsistencies and quirks.
Indeed front-end development in software can be painful. Much of the cruft can be attributed to computing's byzantine history of incremental experimentation. You might take some comfort in knowing that the biological analogue is vastly more complicated: the transformation of genotype to phenotype. Trying to figure out the evolutionary pressures and various mutational accidents that drove particular biological changes feels way harder than trying to figure out WTF Project X was thinking when they decided to pivot from being a social network for dog walkers to a low-latency query planner for a database no one has heard of.
It's actually the beauty of open source that we can align on a few primitives that are reusable in several different contexts to build radically different product experiences and world views. If you think of the phylogenetic tree of software this is exactly what you want to happen.
