First: Sandbox doesn't equal open world
Yup ... thats why i said that i see no connection between them.

And i still dont.
This is a balance between sandbox and story. In a sandbox you have enough things to do in the order you want except when you advance in the main story.
So ...
You are talking about developers focus, rather than ballancing two independend elements of game, right?
I mean ...
If your message is "I want both so ... dont forget to the other while you focus on the first!" ... then yeah, +1, no questions asked!
But when you mentioned ballance, it implied to me that you would like them to reduce one thing, so it dont overshadow the other ... and i dont really think that is necessary ... Baldur's Gate III. is HUUUUUGE sandbox with lots and lots and lots and lots of options ... and yet their story is awesome.

On the other hand, Bloodlines 1 was focused on the story ... with little to none intention to make it like sandbox ... im not even sure if sandbox games was even done back then.

And it didnt stand in the way for it to become cult clasic.
Also the things you can do will affect story later in different ways when you advance the story or visit a small zone of the map where a high quality secondary quest awaits you and lets you act as you want to roleplay your character: scheming and backstabbing, benevolent but rude, charismatic and diplomatic, and more... this gives immersion and replayability with sandbox elements.
Well ...
This is basicaly just definition of sandbox.
And since adding replayability, or allowing people to have their story "what they make it" ... is basicaly its sole purpose, then ... duh, i gues?
when there's no sandbox does mean is more like a visual novel or like an on-rails shooter, very little rpg there.
As VtM:Bloodlines showed us ... this is not true.
I mean, if its your prefference, then yeah ... why not, all the power to you (or something like that people usualy say? dunno, english is not my first, nor second, nor even third language).
Just dont present your opinion as a fact, you diminish its value rather than improve it.

Just a suggestion, take whatever you want from it.
