Wards not necessary support should buy them all. Like you guys said, it's a team game, he support u well, u get alot farm, why not sponsor 1-2ward so he can save that 400 gold up for his item as well.

Being a carry is not all about farm. We know you get all the money. You need the last hit on everything to get them item you need to carry the game but it wont harm if you sponsor a TP to an allies, buying smoke, put some wards or even giving some last hit to your allies who need it.

If your allies need those level and some farm, you know lane is faster so give him the lane and I think a lot carry could survive 2-3 camp in jungle or just pull and farm.

I like to use windrunner, so she is my top 1 pick.

I not pro wr, I depend on teammate, if my side got tanker, or someone that enemy all like to focus, then I can do much in fight, if they all start pick me first, then I die very fast.
Weak in magic dmg and disable. If I forced to get bkb, then my hero become quite weak.
My windrunner stat is like this:
Games played
198
K /D ratio
1.34
K+A/D ratio
3.37
Avg GPM
340.8
Wins
106
Losses
92
Winrate
53.5%

Quite weak.
I really hope that 1 day I can reach at least 70%winrate