You can argue what the earliest version of Superman was or was not, but that is irrelevant to what audiences today think of as Superman. It is certainly possible to make a version of Superman that subverts or upends expectations, but unless that version also connects with audiences it will be for naught. Snyder's problem was not that he didn't make a Superman who was similar to Donner's, etc., but rather that his Superman simply did not connect with a large enough audience. Hopefully Gunn will do better.
Invocations of 'the original intent' feel disingenuous nine times out of ten. People only seem to care about that when the original version just oh so happens to much what they prefer. How many people proselytizing their preferred version of the character under the banner of original intent are also in favor of getting rid of flight and heat vision, of making him a reporter for the Daily Star, of having him raised at an orphanage instead of by the Kents? All of which were true of the original version.
This is true not just of Superman but fandoms in general.