VendingMachine, you're quite right saying that it depends on comparers.

However every language has its own tricks because all the stuff is based on the mentality and ways of life developing through centuries. You'll never know a language in full unless you're a native speaker. But even being one doesn't mean you have an idea about everything.

For an English speaker studying languages like Russian or German it is very confusing to come across the above-mentioned case system or word forms depending on tenses or something of the kind. It's an intricate job to get the full picture and don't feel awkward off and on.