Intel is stepping ahead of TSMC for a bit with 18a and packaging, and that is what is attracting the current level of Foundry interest, by internal and external customers.
ProdCo was held down by the prior reliance on Foundry and once that was removed, the products were better able to compete, with AMD at least. They are also removing legacy support in the architecture, which does not get much press but helps improve x86 performance.
The current effort has been to get competitive, or risk going the way of Global Foundries. Now they have to at least maintain parity if not the occasional chance to leap frog, and the stark difference in R&D spending may yet pay off in some fashion.
But TD needs a good scrubbing. R&D is far too high and they need someone able to make choices other than 'all of the above'.
I think the intent of what PG has been doing is to get competitive enough to at least have the option of spinning off potentially the entire company, and there is clearly at least another year or two of that effort to be done.
If new efforts such as AI produce a smash hit then that delays the need to spin out ProdCo divisions and Foundry. PG and the board have been working to create options, to maximize shareholder value regardless of the ultimate outcome.
If it is more of the same, along with all those ARM vendors taking major share from PC and Datacenter, then x86 vendors will be forced to consolidate. That could lead to a RISC-V division and the next big thing for products. Majority interest in Foundry may be retained regardless.