Optometry moved to a Doctor of Optometry degree at one point. Guess what? They grandfathered the BS optometrists to Doctor of Optometry.
That was before shrewd MBA administrators turned colleges into a den of money mongering thieves.
Nowadays some people even believe you can get a pharmacy degree online because there are online BS to PharmD upgrades.
BTW, other professions were at the 6 year level for their degrees including optometry, podiatry, and dentistry (2+4). Then competition forced everyone to get a bachelors degree before professional school.
MD's are the most overstuffed shirts of all. You don't need that degree to do 80% of medicine. That is why nurses kicked their ass with NP prescribing privileges. I brought this up because pharmacists are attacked as over-educated pill counters. We are, but this principle is true of all professions.