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I've opened an issue on the Source Serif Pro repository requesting an enhancement that hopefully will address the sharp edges problem you mentioned.
As for more info about color fonts and variable fonts from Adobe and how to use them, I suggest reading these two blog posts:
Hopefully a better way will be made to change colors for SVG fonts as using the glyphs panel is quite cumbersome. Below I set 3 red rectangles in Illustrator to blending mode of color, in an attempt to find an easier method for this.
Photoshop has a nice feature of option clicking between the layer underneath to create a clipping mask. Illustrator would need more work to create a custom mask and use make mask in transparency.
Addressing these core usability design issues is what will be important in either keeping these new font technologies in the future or them fading away and be forgotten as multiple master.
font in Arabic language doesn't work