Philosophy is the only justification we have for reality.
Without it... one cannot justify that we exist at all... one cannot justify 'right' or 'wrong'. Without philosophy: reality is an assertion. How is this supposed 'reality' any different from blind faith?
How is speculation ever useless? It can be very informative, and leads to something called "Progress". A great deal of our inventions, innovations, and ideas come from speculating "That wouldn't work... Why wouldn't that work?"

How is speculation ever useless? It can be very informative, and leads to something called "Progress". A great deal of our inventions, innovations, and ideas come from speculating "That wouldn't work... Why wouldn't that work?"
Please give me a home where cloud buffalo roam
Where the dear and the strangers can play
Where sometimes is heard a discouraging word
But the skies are not stormy all day