I whish this article was written one year ago: except for the conditional rendering (that remains the same as you wrote, still more powerful than you say), all the problems you pointed are not a problem anymore with the introduction of hooks and deprecation of class components: for the state "problem" you can use useState hook (hooks should be them selfs a valid reason to NOT let react go) and by using arrow functions you avoid all "this" related problems
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I whish this article was written one year ago: except for the conditional rendering (that remains the same as you wrote, still more powerful than you say), all the problems you pointed are not a problem anymore with the introduction of hooks and deprecation of class components: for the state "problem" you can use useState hook (hooks should be them selfs a valid reason to NOT let react go) and by using arrow functions you avoid all "this" related problems