Why not?

I used pins on my bench made over 20 years ago (used as a main bench since) and I have a solid Oak dining table, seven feet long without any screws other than those that hold the turn-buttons that was made at about the same time. Drawn joints have been used for centuries in wooden buildings and even ships – same technique, but magnified in size.

Unless you have an absolute requirement to incorporate bolts to dismantle the bench for moving at a later date, there is no reason to use any other method. Indeed, drawn pins in a dry mortise/tenon can be knocked out and replaced, otherwise use glue on all the joints and it will be completely solid. I’d recommend that the top is made as a separate piece and then bolted down to the frame. This allows the weight to be controlled to two main pieces.

If you intend using bench-dogs or hold-fasts, keep the top at least 2 inches (50 mm) thick.

It’s important that all the components are at the same moisture content and that the joints fit to the point where they is no sideways movement, though not so tight as to require force to assemble them.

The best method there is. Good luck