Well my good friend, the answer to SB's downplay is simple(As well as ComicVine's):
They don't like Fate. They had to be dragged, kicking and screaming, to even go with Goetia being Galaxy level and Casual Planet Buster. For Lostbelt Zeus to be Anti-Solar System at his strongest(which is beginning to look to be Anti-Space Time AND Anti-Galaxy too from further Fan Translations) and he's casual Planet Buster as well.
They cannot accept that Servants can bust Countries because "They never consistently show it", same deal with speed feats(With the added touch of literally going "Look at how many times they say Faster than Sound and not Faster Than Lightning") or anything else that actually fits where they are strength wise because it would basically make them no longer the easy horse to grasp.
These ARE the same people, whoever, that will accept Continental Seven Deadly Sins over terrible panel scaling, they will accept Maidens being able to suddenly be 1/3rd of an Atomic Bomb due to terrible calcs in RWBY and basically wank Magical Index to the Moon due to nothing more than words being said and nothing actually happening(Accelerator's most wanked feat? It's literally just Corazon creating something "equal to Gungnir" and Accelerator destroys it before it does anything). They will even believe that Rule 13 only benefits certain verses and will lie their asses off if there's something that can blow past it(See Goujou's Infinity and Accelerator's Shields... despite they both can be dispelled through the typical means in their own Reality, let alone other series).
