2) Wikipedia does not have a shortage of editors. It is in fact overwhelmed with editors who have a net-negative impact on Wikipedia's stated mission. By failing to read the rules and failing to accept the rules when informed of them, you have made yourself a net-negative contributor. These rules are not inscrutable, but are publicly available and explained in depth. The admin who removed your content provided a link to the relevant rule.
3) Wikipedia's primary challenge today is quality, not quantity. The overwhelming number of abusive users create an enormous burden of editing. The pedants, petty tyrants and robots of Wikipedia may be a deterrent to new contributors, but they also form the immune system that protects Wikipedia against abuse.
4) In the space of 15 years, Wikipedia has become the largest and highest-quality encyclopedia available. The community has developed a complex set of processes to ensure continued quality. Those processes may be imperfect, but they are demonstrably effective. Your criticism comes from a position of complete ignorance as to the necessity and efficacy of those processes.