Once upon a time, Episcopalians really did believe in truth and error, and condemned Presbyterianism as a departure from true Christianity (winning over the crown didn’t hurt efforts to prove Anglicanism true). One of the errors of Presbyterianism was ordaining the laity to be rulers in the church (read elders). Here is how one pamphleteer at the end of the seventeenth century put it (Parallel between episcopacy & presbytery; or The Church of England vindicated from all the false and uncharitable reports and suggestions of either papist or Presbyterian :
. . .which of these two governments have the more effectual means to procure the end of Church-government, the preservation of truth and peace, and the suppression of heresy and schism. I answer Episcopal; for ‘tis strange, that laymen, from whose education has no knowledge beyond their trades and such like affairs can be expected, should be as fit instruments for such kind of employments, as grave and learned scholars, whose only business is to tread the path of all arts, both humane and Divine.
Come to think of it, in an elite world of princes and bishops having all the power, putting the affairs of heaven and hell in the hands of ordinary laymen was risky. And that diceyness may explain why Presbyterians throughout the modern era have looked for professionals — physicians, attorneys, and academics — to train and ordain as elders. At least these well educated persons would know more than the ordinary bishop.