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To be fair, the incompatible 10 speed groups are positively ancient. You would be looking at parts from groupsets released pre-2012 and you wouldn't be able to find parts that old sold as new in shops. The two "current" 10 speed groups, tiagra 4700 and grx 400 were released in 2015 and 2019 respectively.

From Escape Collective: "Most unexpected is that the new derailleurs and shifters are interchangeable with CUES U6030, but not any of the previous generations of Shimano 11-speed road or Tiagra 4700. The reason? Shimano increased the cable pull ratio for the new Tiagra."

Is this Helen Montgomery person affiliated with either the Tories or Reform in any way, I wonder?

I strongly suspect it's going to be the same pull ratio as the rest of 11sp road, most of it looks like it came direct from 105 R7000. Tiagra 4700 for that matter is 11sp road pull ratio, so don't see why they'd change it.

The existing 11sp 11-34 is 11-13-15-17-19-21-23-25-27-30-34, so it's the same as that just with the last three swapped out. I use the 11-34 across a lot of bikes and I don't find it problematic. You're not cruising around in the 11-13 range anyway, it's sprinting or chasing downhill only. 50-11 @90RPM on 700x28 is 53km/h, 50-13 is 45km/h. +1km/h if you are on 52/36. For racing, the 11-32 or below is going to be optimal, it has a 12. If you're not racing, you don't really need it IMO. For that matter, people won the Tour on larger sprockets. Merckx never had smaller than a 13T, the first win with a 12T was Bernard Hinault in 1979. 11T wasn't a thing until 9sp Dura-Ace 7700 in the late 90s.

4700 was 11sp pull ratio. The first generation 10sp cables under the bars (5700/6700) had a very convoluted cable routing that ate cables. They fixed this with 5800/6800 11sp and then used that for Tiagra 4700, just in 10sp. So no reason this wouldn't be, it looks very much like 105 R7000 trickle down, some components just a little heavier, some (like the FD) look like they are the exact R7000 component.

I have Tiagra on my do-it-all bike, and it's great. BUT Tiagra (especially) compatibility is a nightmare. Never mind 9/10 and now 11 speed incompatibilities, there were 2 variations of 10 speed groups with different pull ratios making compatibility a right PITA. Personally if I want to replace a derailleur, I'd prefer not to have to spend hours going through spec sheets with a fine tooth comb. If I want to (ahem... aspire to) go fast, I have a road bike with Ultegra Di2, but for utility bikes, touring etc., the "just works" compatibility of CUES is welcome.

True, although his Laureus nomination only mentioned his stage win, no reference to anything else!

I had a pair of Assioma Uno power meter pedals a few years ago. They worked really well for a while, and I liked being able to swap them between different bikes really easily. Unfortunately after about 18 months of use, they started spitting out random data - absolute junk measurements. I contacted Assioma and they looked at the data online (which they apparently are able to do for all their units) agreed that there was a fault, and sent me a new spindle (I had to pay postage). That worked well for about 18 months, and then started giving me random, junk data, so I threw them in the bin and now I no longer use a power meter.

A little unfair - he was double national champion, as well as picking up several top ten placings elsewhere. Granted it's not a Giro win, but still.