Seriously, the USMC certainly is a fine LIGHT infantry organization, but the history they teach young marines is only a part of the story. Unfortunately, some people choose to ignore or minimize the rest.
Vertical envelopment was something we developed kind of at the end of Korea and it’s worked out really well. We also use it in conjunction with amphibious assaults from over the horizon.
We do retain the amphib capability with our ARGs (Amphibious Ready Groups or whatever they call them today) with the MV-22 Osprey and the LCACs. Plus it’s a capability we can use (and have used) to put troops ashore in rescues and humanitarian situations.
Using the named army divisions in the assault does NOT offer the same capabilities as having a Marine Expeditionary Unit with its embedded air support and delivery units (the reinforced helicopter/Osprey squadron with Harriers). The air assault army divisions do NOT bring their logistics train with them, making it difficult to have a SUSTAINABLE operation of more than a couple of days.