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The non high-speed goes to the other side of london and takes 30 minutes longer.
Sounds like I am years out of date but BITD the Faversham slow tickets were about 20% cheaper than a similar length journey I used to do down to Hampshire.
Victoria worked for me versus (IIRC) St Pancras but obviously not for everyone.
EDIT: I just looked this up and Faversham (fast) is about the same price as Petersfield for a weekday anytime ticket, whereas Faversham (slow) is 15% cheaper for a 10 minute longer journey than Petersfield. I think the suggestion is broadly correct.
Yes, but the non-high speed line is cheaper than equivalent journeys on lines that don't have high speed. I used to go to see family in Faversham at the weekend and always opted out of high speed to save cash.
More capacity is always good, even for those not directly using the new capacity.