When developing pine or other species that can readily back bud it is important to remember that the final design may easily be based on branches that are not apparent in the early stages. With proper care and timing many new branches are possible with successive pruning of sacrifice leaders and branches. During the early stages of growth 1-8 years for example one can expect new buds and branches on the lower trunk portion as well.
My suggestion is to focus on developing nebari, trunk movement and planning for taper while growing the trunk to sufficient thickness for the design you are working to achieve. Only remove foliage or branches to manage or balance growth.( too strong or too weak) The other reason for removing foliage or branches is to protect more valuable design portions and prevent inverse taper or unsightly bulges.
In short we have a tendency to try to accomplish too much in too short a period of time. I find it best to use the growth to foster more growth and eventually work with the best available options. This does not slow the process but actually speeds the process and gives better results! While you are thickening the trunk, you are also beginning to develop nebari, movement, taper and primary branching!
This saves a lot of time after the trunk is judged to be of the right thickness for the design. And just as importantly you will find that every tree grows somewhat differently in stages, therefore keeping options longer allows on to make the most of each tree as one is able to adapt design later in the developmental process.
Nebari, movement and taper are the keys! Grafting can place branches if needed.