Is the argument that with the EC one can't get to the required number of EC votes by only winning 15 state's EC votes, whereas by popular vote it is theoretically possible to win a plurality of votes by only counting the votes in 15 States? But, if that is the argument, isn't it a bit contrived ? Is it based on the too simplistic observation that the voting population of just 15 States exceeds the sum of voters in all the other States???
As things stand now of course it is possible to gain the required EC votes by winning only a handfull, a medium sized handful, of States? In the last election, candidates did in fact virtually pass over certain States by making no, or only token, appearances in them.
A compromise, though I haven't thought it through, might be to require that all States proportion their allotted EC votes. As it is now all but one or two states are winner take all states. Though if we were to do that, what would be gained other than to obscure the closeness of a State's vote to a somewhat lesser extent than it is obscured now, which is total opaqueness. Even though democracy is the least efficient form of government, and in Churchill's words "the worst form," why not go all the way to one-person-one-vote and suffer the chance of becoming India, the world's most democratic large nation?
The one thing I see most clearly is that by retaining the EC in preference to democracy you create an almost iron clad guarantee of a two party only system; thus avoiding the chaos of a plethora of political parties and the necessity of forming a governing body out of disparate parties, as in the parliamentary system. Actually the parliamentary system would be my personal preference, as I think such rag tag governments are somewhat less likely to fall prey to Trump-like, authoritarian, mentally ill despots. And when that does happen, under the parliamentary system it is more difficult for the despot to consolidate sufficient power that the voters can't send them packing in the next round. The evil in both republics and parliamentary governments is likely to be done via the judiciary. So how, and with what checks and balances, members of the judiciary are chosen is key to happy endings.
In the U.S. I consider getting a reversal on Citizens United as a far more pressing issue than whether or not to do away with the EC. The reality of Citizens United helps, I believe, to make my point that the Judiciary is key to happy endings, and that evil tampering with government is likely to be worked via the judiciary.