I feel like there is a general approach for parity these days that it kind of becomes irrelevant. So the pc version has better AO and slightly better textures. So the xbonx version is CBR 2160 and the Pro version is CBR1800. I dont think those are discernible enough differences to warrant versions of trailers to be made for every platform a game is appearing on. Becasue generally those difference can only be noticed when you place them side by side and who plays games like that? So if it isn't affecting the consumer why would it matter if the PC or xbonx or PS4pro version of a game is being used to capture footage for all promotional material? And when it comes to PC do you just have footage thats running 3 titans in sli? The minimum spec? The maximum? Maybe all 3? Then theres the ps4 base version, pro, xbone, xbonx, switch maybe? All being made individually for each platform and all for the same 1.5 minute trailer. Doesnt seem practical and honestly, i can't imagine most consumers would care.
I mean, this isn't like the 90's when they tried to advertise games on the psone as having cgi graphics. This is advertsing a game looking marginally better or worse than the platform you own. I honestly couldn't care less tbh lol.
First off, you are assuming that there aren't any differences that anyone would notice.
Secondly, you are assuming that no one cares about graphics and having the superior version. This is absolutely not true.
Thirdly, There are those that would at least like to see true difference so that they can decide for themselves what is and isn't enough for them to deal with.
Fourthly, These companies, especially these AAA ones are filthy rich and could definitely afford to make multiple versions of trailers. Even if it is costly now, if they made it a common practice, the method would inevitably become streamlined so that it was easier and less expensive to do.
All of this would only benefit consumers. Even if you personally don't care right now, others don't like being lied to when being sold something.
Like I said before, companies really will push the line if they can. It's not bad to express your want for more honesty in these situations. They have more than enough resources to figure something out.