To Wiggins, it matters to the tune of very large sums of money, being the difference between his market value after winning TdF thanks to time gains in the TTs vs. not so doing.
To the rest of us, it doesn't matter. Except that if marginal gains on the bike aerodynamics don't matter, then we might as well just go for a ride and not trouble the timekeeper. So it matters a lot if your hobby is trying to get the best TT times you can.
To Wiggins, it matters to the tune of very large sums of money, being the difference between his market value after winning TdF thanks to time gains in the TTs vs. not so doing.
To the rest of us, it doesn't matter. Except that if marginal gains on the bike aerodynamics don't matter, then we might as well just go for a ride and not trouble the timekeeper. So it matters a lot if your hobby is trying to get the best TT times you can.