Bootstrap 4 or native html/css + flexbox?

Question

Layout

What to choose: bootstrap 4 or pure html/css + flexbox?
If you "look" from the position:
- further support
- purity
- load

UPD: I did not immediately indicate, I am writing now. I'm asking from a client perspective. It is necessary that in the future, third-party developers can understand the code so that it is understandable to them.

Answer 1

There is not much to choose from - bootstrap should only be used when the design is drawn specifically for it and using its components. It is also acceptable if you are a backender and in general all these troubles with the layout have not come up against you, but you need to sculpt something.
In all other cases "native html/css" should be used.

Answer 2

Bootstrap 4 or native html/css + flexbox?

native html/css + flexbox?

If you "look" from the position:
- further support
- cleanliness
- load

1. Support - actually what to support? The customer decides to change a piece of design, or let's say in the future he will draw a mobile menu, and you will have it on the bootstrap. It will be necessary to redo everything ...
2. Cleanliness - a lot of classes of columns, containers and row, + a bunch of classes of the bootstrap itself that mean something. There, instead of writing margin-bottom: 20px, a person will write a mg-20 class and will translate all styles into classes.
3. Load - if everything is done correctly, the site will fly even into space.