The HiFive1 did have Arduino IDE support, but Hifive1 revb (the red-v is based on this board) dropped it without reason. The Freedomstudio lacks samples and has no libraries (want to use generic LCD librarry? Port it yourself!). I own RED-V board and Hifive revb (the exact same as RED-V, but with wifi, bluetooth and RGB led). These boards are expensive paperweights to me until I have basic libraries. Pretty sure other users feel the same.
Is there any plans to restore Arduino IDE support? Please!