>reactively
Yes, that tends to be the case. Fortunately, tricking has way more generous i-frames.
That said, I didn't mention something important. If you hold the left stick with the intention to move as soon as the animation ends, you'll cancel said animation earlier, and the i-frames will go with it. Like this, the i-frames will only last 27 frames. Also, if you hold L1 to block (or to prepare another 'trick', perhaps *if you don't do the v2 variation of a follow-up trick*) during the summoning animation, you'll cancel the i-frames even earlier. They will only last 23 frames like this.
Typically a player will do one of these things, so you generally are seeing 23-27 i-frames most of the time.
>not that useful
Tricking tends to outshine it unless it's a lingering hitbox (capable of either outlasting your i-frames) or a multi attack that you likely won't be able to trick in time, in which case you'd want to stay away, or roll out of harm's way, though this is pretty rare, as you note.