Regrettable most DIYers, really don't understand that the in majority of electrical installation, repair and replacements, they are generally out of their depth and do not have the skill or knowledge to complete these tasks successfully or safely.As for terminology/language, this is primarily a forum to which DIYers come to ask questions. What proportion of such people would you expect to understand "R1+R2" or "Zs"? (would suggest incredibly few)
I agree DIYers do come here to ask questions, but they must realise that they to will require to give satisfactory answers, if they are unwilling to do that, and this makes this a quieter but safer place to be, so be it!