@monkers I took delivery of my new bike in mid December after spending six months pondering many possibilities. It takes me a very long time to make the decision. I looked at Tifosi for weeks and weeks** and was sorely tempted but in the end I wasn't convinced it was the right bike for me. I would advise you to read around a lot on this one. I bought a Kinesis Tripster ATR-V3 Titanium (2021 model), it was
@Mo1959 who inspired me to look at titanium. I hadn't considered it at all until the day she mentioned she was buying a titanium bike. I don't know the R2 other than from the Kinesis website, it looks to be a beautiful machine. I can tell you I am absolutely delighted with the overall quality of my Kinesis. Superb design, very well made, comfortable and beautiful to look at. I can recommend Kinesis as a brand without hesitation.
On the gearing, brakes, tubeless thing I'm not technical enough to provide the supporting detail but would my experience is this. The Kinesis is 50/34 - 34/12 with 35mm tubeless winter tyres. To my surprise now I have got used to the bike I can comfortably knock out 19/20mph on the flat, above this and I'm working hard ( I wouldn't be on my Cervelo). For winter this gearing is letting me climb better than expected and I'm grabbing a few PBs.
I have 28mm tubeless on my summer Cervelo and on the Kinesis. The only issue I've experienced is the valves can get gummed up. The solution myself and a friend have come up with for both of us is contrary to the popular view. Most cyclists store bikes running tubeless with the valve at the top. It's our belief this creates the problem of valves gumming up. We store with valves at the bottom. The theory is this. Parked at the top sealant can flow down the tyre wall in to the valve while when parked at the bottom any sealant near the valve will be draining down and away from the valve. We've also found sticky valves are a bigger problem in winter. Why? We don't ride so often. In summer I would ride 3/4 times a week which means checking the pressure every ride and so letting air in and out of the valve regularly. In winter it can be only once a week so the valve has more chance to gum up. I pop in to the garage every other day and blip the valves to let a little air out. This approach has solved the problem for both of us.
On discs v rims personally I won't go back to rim brakes. Do discs stop quicker than rims? I'm not sure. Any time I've needed an emergency stop with either system it's worked!!! Where I feel there is a real benefit is discs allow me to "feather" the brakes more easily and scrub just a little speed off when I need it. I've never been very good at this with rim brakes. I feel more confident on a disc braked bike which I feel makes my riding smoother and more efficient.
** I actually ordered one and then cancelled.