I’m a very lefty lefty, and I have intentionally chosen to be able to play both open and closed-handed on a lefty and righty kit. I have two kits set up in my basement specifically so I can train all 4 ways. I’ve been doing this for about 4 months, and the hands were easy-ish. The hard part is training my left foot to do heel-toe and swivel on the bass, and my right foot to jump up really quick on the hi-hat. It has been fun and challenging so far.I took your post to mean that everyone should develop the ability to play proficiently with either hand/foot. Sorry if that is not what you meant.
As someone who has experienced this left-handed bordering-on-discrimination problem for 45 years, I feel it's not ok to force us to just live in a right-handed world. It doesn't have to be that way and all teachers/coaches should give students/players the option of playing however they feel comfortable doing. I think I have derailed this intent of this original post and I apologize to the OP.