actually e38,e65 and f01 were always the starters of new design languages, probably with earlier 7ers also
Regarding exterior design, yes the E65 and F01 did initiate new BMW design language. I do not believe the E23, E32, & E38 fully did though. The first BMWs approved after Bangle was no longer directly leading BMW brand design were the E71 and F01. If one pays attention, no all-new BMW design proposals would've been approved in 2004.
Only those that had some design roots in 2003 or earlier, might have reached the design freeze like the E70, M3, E92/93, and E81/82. The next ones were the E71 and F01 in 2005. The first new BMW design proposal approved without Bangle fully present at BMW Group, was the F30 on March 2, 2009.
The E38 design was the last one frozen before Bangle arrived at BMW in Oct. 1992, while being salvaged under Boyke Boyer for 2.5 years. The first were the E39 and E37, that followed the E38 philosophy. The 1982 E30 had some cues related to the 70s models, yet had close design ties to the yet to be finished E32 (1983) and E34 (1985). The E31 (1986) and E36 (1987-88) bridged the gap between the E32-34 and the rounded design evolution philosophy delegated by Claus Luthe circa 1989, that later appeared on the E38, E39, and E46.
Unlike the E31 and E36, the E38 was the first BMW to fully follow the new rounded design paradigm established before Luthe left BMW in April 1990, while the E36 proved to be a mix and match of boxy and rounded, again mostly having its creative roots in 1987-88. He wasn't there for final approval of the E38, but like many of us know, he laid out the guidelines. The 3-series and X5 have often proven to be a bridge between old and new BMW design.
The E46's hooded headlamps and taillights each previewed the E38 LCI (late 1998), E53 X5 (1999), and the E65 finished several months later in 1998-99. Seems that, if not for the last minute 2003 changes to the E90 taillights, it would've done similarly. The E90 (related to E65 and E60) was more conservative, as were the later unrelated F01 and F10. Unlike the E60 and E87, it was finished 1 year after the E65 controversy. The F30 introduced headlights that are connected to the grille, which almost every new BMW follows and so will the G11 and G30.
The E53 X5 (and Z8) was the last all-new BMW to partly utilize the rounded evolution of the original Neue Klasse philosophy and driver-oriented cockpit (borrowed from the E39) until the E70. In fact, the X5 is probably the only current BMW model that managed to never lose the driver-focused cockpit since the E21 was introduced. The E70 reintroduced the angled dash.
The E46, E53, E52 Z8 were also rare bridge gap before the Bangle revolution in 2001-02, with only the Z8 having a semblance of the new interior philosophy with a non-driver angled dash.
Not sure where this fits in???
"Modernized" BMW design
"Flush" BMW design-Bridge gap
Rounded Design Philosophy established
Rounded Bangle influence-Bridge gap
Official Bangle Revolution