weekendwarrior said:
A 8mm shank bit will always feel a bit more substantial than the same 1/4" shank bit if they're made of similar materials.
Yes, you are absolutely correct.
Though for the intended purpose of less than 1/2" cutters I don't think it's a huge concern/consideration. Especially when one has an OF1400 to utilise/step up to 1/2" bits.
If one only owned an OF1010 then I confess I can see the advantage of the 8mm Festool bits to give a bit more "reach" in terms of what tasks you could tackle.