the thing is that having a different rendering engine is no longer an advantage. on the contrary, it gets in the way. as a web developer i'd prefer that there only be one browser i need to support, that is, one rendering engine, that guarantees that my site works everywhere.

as a user i want new features to work and be taken up quickly. i don't want to be told that a website doesn't work in my browser, or worse, have it fail silently.

different browser are fine for the UI, tab handling, bookmarks, extensions, etc. but rendering a website should work uniformly without fail.

the reason why we need multiple rendering engines is because monoculture is bad for security and it's also not a good idea to allow a single company to define how the web works.

however, most users or developers don't care to much about that.

if that rendering engine would be developed and maintained by an independent consortium like mozilla, then this would actually be sort of acceptable, as it would at least solve the monopoly problem (if a resource is best managed as a monopoly, then that monopoly must be owned by the community at large, and not by a company with selfish commercial interests.)

it wouldn't solve the security problem however.