Summary:- Analyzing the substance of the arguments; there's a consensus in ☑ favor of the proposal.
Accordingly, the Sun is designated as a generally-unreliable publication. References from the Sun shall be actively discouraged from being used in any article and they shall neither be used for determining the notability of any subject. An edit filter should be put in place to warn editors attempting to use the Sun as a reference. Nothing enacted in this closure, over-rides WP:ABOUTSELF.
There exists a broad consensus (even among-st the opposing faction) that the Sun is quite unreliable as a source for a variety of reasons including outright fabrication and is perceived as so, per Feminist's cites. More or less, it is a flag-bearer of sensationalist tabloid-journalism.
Whilst some have noted their thriving in an environment governed by strict libel laws and a strong code-of-conduct, (whose breaches are rigidly governed), they don't match the numerical strength of the supporters.
Many of the opposing argument(s), when analysed fail to mount as effective rebuttals to the above point.
Advising an editor (esp. those outside of Great Britain) against using a part. source; in light of their unreliability, is not akin to treating them as idiots (does everybody under the sun know about the quality of the Sun?) and we have a history of using EFs to warn against usage of such seemingly-reliable sources. Furthermore, this closure does neither permit a blacklisting nor a wholesale nuking of all Sun references, without any discretion.
That we use other trash-sources is never a good reason to oppose (for it can be effectively weaponised as a circular argument across discussions, to prevent deprecation of any source at all) and there is nothing prohibiting any interested editor from launching referendum-RFCs for those sources.
In contrary to some arguments, the audience-reach is not a quite-deciding factor in the wiki-reliability of a source and press-freedom hardly equates to granting a liberty for editors' using low-quality sources in writing an encyclopedia. Neither do I see any political motivation in the RFC.
There are some philosophical arguments against the very concept of prohibiting the usage of a source in this manner; the deciding of which has effectively boiled down to a count-of-noses.
I also note that many have noted that any uncontroversial information which can be sourced to the Sun (sports score-lines et al) can almost-always be sourced to another source of repute.
P.S:-There has been a feeling among the opposing side that this can lead to a draconian purge of Sun references from WP without due discretion and that the newbies will bear the brunt of any over-zealous enforcement.
Hence, I will urge all editors to exercise due restrain and use common sense; whilst dealing with removals. For an example, please harvest some efforts to source a cited-info to a reliable source, prior to removal of a DM cite.
P.P.S:- FWIW, I do not find the discussions about the use/misuse of DS notices any relevant to the issue and whether any existing DS covers these issues can be staked out over another RFC or placed before the arbitrators(??); if there's an active bone of contention. Same about blocks.
Pure nonsense, and, embarrassingly, obviously a cut/paste of the DM close, right down to including references to the "DM" in it.