Difficult doesn't mean impossible. And both of them are pretty experienced drivers, which probably helped.
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I dare to say Polo was probably not that difficult car to drive in its nature but a rather difficult (or complex) car to properly set and service.
I somewhat disagree. There was quite a number of updates inlcuding 4 jokers (last one in July 2021), some development was shared with Škoda. You can find them here, the name of the document is "2022 - Complete List of Homologated Vehicles with Extensions - Dec. 2021": https://www.fia.com/regulation/category/760
IMHO Fiesta was homologated way too early when it was not fully developed.
We can all agree the Polo is quick, although it may soon be surpassed by other manufacturers bringing new cars or further developing their current ones.
So what is the reason that relatively few people use them on the international stage? Is it about ongoing works support? Not just with jokers but I mean engineering and parts support on events. Skoda have made a point of having a service truck at WRC and some ERC events and will also supply engineers to help with setup and servicing. I wonder whether this is one reason Gryazin decided to join up with Toksport? I think he said something to that effect but i can’t remember where i heard it.
The Rally2 Fiesta was largely developed by the guy who was Ogier's engineer while he was at M-Sport.
But they didnt do nearly as much testing as Skoda and VW before releasing it. There could be many reasons for this but I suspect some over-confidence after the success of the Fiesta R5. Plus those drivers that came and tried it all said it was amazing.