Be careful when you want make a website or mobile apps never give all work to one seller who well say to you I’ll be your develop and design for you
Again never do that
Give everyone his/her work
Find designer and give him / her to do frontend then find developer to do your backend
If some sellers tell you we have group to do that don’t trust
Just give everyone his / her work you will be in safe area and you will never regret
I am completely agree with you.
And also avoid full stack first