why cannot install 1 piece barstem on domane slr gen4 any technical or safety reasons?

hi guys

I’m sure not the only one here have this question on his head,why it’s not possible to install integrated handlebar like madone gen7 or even 8 barstem on domane gen4 slr

the spacers almost identical the hardware underneath spacers almost identical so why it can’t be,I did ask trek support yesterday and all I got as they said our engineers never tell us why

at least make one compatible rather than the only option available with round ugly looking spacers

any third party option available and compatible?