You can see what ICOM need to do as an upgrade to the IC-705. Let's call this the IC-705A. They could include an ATU internally and offer 4m. If they did these, they would probably easily compete against the Yaesu FTX-1F if it ever does come to market.
I am losing faith with Yaesu, who appear to be drifting yet again. The last I heard was they were planning a worldwide launch after FCC approval. With the goings-on in the USA, I cannot see the FCC approving it soon. Also, Japan now faces a 10% tariff in the USA. I expect all Japanese manufacturers are revisiting their business plans. We have heard nothing more about this product since it appeared under glass last summer in Tokyo. I expect (if not withdrawn altogether!) Yaesu is trying to see which features will make it a real winner.
In my view the FTX-1F was put out in Tokyo to judge reaction. Unless it comes to market very soon, it is dead. It is interesting that we have not even seen updated specs!
Meanwhile, the IC-705 is already years old, has many features already and the only thing against it is price. Just imagine if ICOM dropped its price by £150. Yaesu would be scrabbling around in a right mess.