That would be solving so many problems.
1. Repairability - You can replace all packs, or just some. Depends on your financial situation.
2. Independence - You are not dependent when your company will stop manufacturing your special battery pack.
3. Longevity - You can buy 10 year old car with dead battery and buy latest set of standard packs with latest battery technology, suddenly your car is having twice the range than it was a new. Like HDD -> SSD
4. Less dependency on street infrastructure - You can charge the car on a charger or if you can't charge at your place, you can just pull one or two packs out of your car and charge them on 230V in your apartment or hotel room.
5. No wall box needed - You can have two sets of these standardized packs. You can put one into garage where it will be charged during the day (i.e. Solar array) and you can use the other one in your car. Swap them when needed.