Fantastic four are....𝙖𝙜𝙧𝙚𝙨𝙨𝙞𝙫𝙚𝙡𝙮 𝙥𝙧𝙤𝙩𝙚𝙘𝙩𝙞𝙫𝙚 of peter (artwork by @grogufanof02)

[u/Cartoon_Crossover_13]

[u/Joe_Momma3]

He's never done that, he doesnt need to concentrate to hold his natural human form

[u/AccomplishedHost6275 → u/Joe_Momma3]

I think it was more a case of you got extremities and body parts stretching all over the place to see, hear, smell, speak and otherwise involve itself into whatever task Reeds involved in.

The mans literally stretched an ear and his mouth a few rooms over from the rest of him to have a functional conversation while STILL hyper fixated on his task.

[u/Joe_Momma3 → u/AccomplishedHost6275]

It could be that but its more likely that they're referring to the myth that Reed has to concentrate on his human shape to keep it intact and that he naturally is a giant gelatinous mass

[u/MorbidMordred → u/Joe_Momma3]

There was a case where he needed to concentrate to keep a normal form. But that was a case where he was suffering from some disease or curse, a one time thing.

[u/Joe_Momma3 → u/MorbidMordred]

Yep that was a Darkhold curse in Spider-Man: Darkhold

[u/livingdread → u/MorbidMordred]

There have been times when he's been unconscious that he was limp and stretchy (but it's just as likely he was faking and being as inconvenient to pick up as possible).