What, exactly, is the problem here? The OSSC’s weaknesses are no secret. If the OSSC doesn’t do something you need or doesn’t do it to your satisfaction, you’re using the wrong tool for the job. If you need a framebuffered scaler that can deinterlace well, you’d get a Framemeister. If you need a no-perceptible-lag line multiplier, you’d get an OSSC.
You wouldn’t buy an adjustable wrench to hammer nails, nor buy a road car for a day out on the lake, would you?