From time to time clients come to me having looked at videos online and tried to teach themselves to swim "TI Style". I have to remind them that good swimming is good swimming and TI coaches are not trying to teach people to swim "differently". Nor we should not obsess with emulating videos of others we have seen swimming. We are all dfferent shapes and sizes.
Too steep an angle of entry or too early an entry for example can lead to either to deep and arm or a "ski jump" trajectory that can lead to dropping the elbow under the water. A nice natural relaxed arm recovery with mail slot entry facilitating the whole arm sliding into the water through the same whole is fine. That exact point of entry will be determined by your own biomechanics, but should be a straight line to the final hand position under the water at full extension. Nothing forced, everything relaxed and natural.