Yamato being broken is a detail in 4 not 5 and thus has no impact on the current plot of DMC5. Therefore showing it being broken does nothing for the plot at hand. Now if your argument was showing Vergil become Nelo Angelo then I might be inclined to agree with you since I feel that had more weight in the story than Yamato being broken. And even then that is what the manga/comic is therefore. To tackle the minor details. If these creators could fit everything in their product's story then they wouldn't need these bonus materials.
They could've shown Kyrie in the opening cutscene right when Nero lost his arm. They showed Eva when they didn't have to and probably could've gotten away with it too if they did something similar with Kyrie.
You do know MGS2 come out like almost 20 years ago. DMC5 was made today using the RE engine and photorealistic models so development costs are far higher now than the PS2 era and going through the effort of modelling something as detailed like MUNDUS just for a less than 5 minute flashback probably wouldn't be worth it for the budget.
Yeah even than that is the last movie in the global phenomenon super successful Harry Potter movie franchise that is about a decade old (with it's last movie) series of consistently well critically and financially received for films compared to the niche and let's be honest up and down Devil May Cry franchise. So of course the Deathly Hallows (which I believe is either in the top 10 or was in the top 10 highest grossing movies of all time) had a far more massive budget compared to DMC5 (which despite it's high production values still had a limited budget that had to be properly distributed between more avenues than a film production does like you know gameplay, bug testing, balance, etc). Then there is time too.
Explaining how Yamato is broken is an important element, since it was something that was put in a previous main installment but was never explained later...
It's like Luke skywalker sword in the force awaken, everyone expect to explain how in the hell is there trought some flashback or some explanation in episode 9 rise of skywalker, I didn't expect them to answer a such important peace of the story in a manga or novel...
Since Yamato is vergil sword and we last see it in dmc 3 in vergil hand, I would have expected an explanation on how the hell i was broken and was there in dmc 4...
I put mgs 2 in consideration to let you understand how cutscene are made in videogame and How they cheat you to think that many time during scene you are in a whole new environment but they only create what you see on the screen... Since they should have just made mundus model and and some environments...
Many new game have almost the budget of a movie, like red dead redemption 2 and metal gear solid v... Dmc 5 doesn't have the same budget of this two game but its also a triple A game and had more budget than resident evil 2 who was very expensive since more than 800 people worked on re 2 remake, so re 2 budget was probably very high.... Dmc 5 budget is higher than Re 2 remake budget and we are talking about million here probably 40 or 50 million dollars to make this game or more, so I think they could have maked 30 second of flashback to explain that, probably they just realize it was not important for dmc 5 main story and they decided to not put that in game... If they wanted to put the scene in there even if they didn't have enough budget like you sayd they could have put vergil into a black environment talking whit mundus and having mundus in his tree eye form instead of having him in his statues form, or they could have made the whole flashback scene whit a stilish cartoon like kill Bill flashback... There were thousand of way to make that scene in game, they probably think it was unnecessary...
And dude just relax, I just say that I would have liked to see that scene in the game, since I waited mundus and vergil scene since dmc 3 and to see the Yamato broken from dmc 4, it's been 15 years, and I personally would have liked to have just a brief flashback of about 30 second to show how that happened... It's just something I would have loved to see and in my opinion they could have put it in there whit easy...
If they ever make a vergil dlc I hope they put some flashback in there
