S1 has 3000 more sends on tracks than Pro Tools does, and that's great.
But PT has sends on their FX channels, while S1 doesn't. This is probably to prevent people who don't have signal flow down-pat from making unintentional and/or dangerous feedback loops. This also kind of makes it difficult and messy to do super creative things with FX easily.
For example, in PT, using an Aux Input as an FX channel, you can send the signal of a delay back to itself, turn the delay insert's feedback to 0, and then stack another insert on top of it so that every time the delay signal passes through, it also gets processed by the second insert. So you can have a delay, that goes through a 4-pole low pass with high resonance, and the feedback being sent through itself results in a delay where a certain frequency range is slightly increased in amplitude every time it passes through.
It's a really messy process with an extra bus on the mixing board to achieve the same thing in S1 as of now. Stop protecting the amateurs and give the big boys the toys!