Even through the progressive era when some of these things changed, parties were more powerful and they definitely filtered popular intent. And that way more than today. We didn't have small 'd' democratic presidential primaries until the 70s and this last one was the first for the Democrats.
EDIT: Although going along with your point, I also remember the framers wanting the electors to be determined at the local level (district) rather than state. That would change things significantly, IMO.
As per Hamilton and Madison in my first link above, the original intention was to have members of the electoral college be unbiased, well-respected, well-educated citizens who each independently voted for whichever candidate they thought would be the best president. Only the members of the electoral college directly voted for a specific presidential candidate. On a local level, the presidential election consists of electing members of the electoral college, who each were not originally envisioned to be pledged to one specific presidential candidate.
This system quickly proved to be overly idealistic, with respect to the fast rise of political parties in the US. Anyway, my original point was simply that an under-informed voting public was always a major concern in American democracy, rather than a new or modern concern.
To be clear, I'm not indicating that the framers had the right idea about this. Rather, just mentioning that the risks of under-informed general populace exercising direct democratic election has been under consideration since the nation's founding.
[1] https://en.wikipedia.org/wiki/United_States_Electoral_Colleg...
[2] https://en.wikipedia.org/wiki/Seventeenth_Amendment_to_the_U...