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I managed 2xTCRs and a TABR plus a lot of audax and training miles on mine but someone else's let go after a month or so. It's a shit design that leaves very little metal where the replaceable hanger bolts onto. It's why when mine snapped I got a Tripster on warranty instead of another 4S. The new 4S frame has TA dropouts like the Tripster so should have no problems.
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https://www.sigmasports.com/item/Kinesis/Racelight-4S-Disc-Frameset/AFK0
So this is a 2018 model, and to be avoided?
Same pic on Merlin website
Ta, thought I read this somewhere on another thread