One solution would be to create a registrar account for each legal entity or incorporated business you own. I admit, they likely need to refine the limitations

One solution would be to create a registrar account for each legal entity or incorporated business you own. I admit, they likely need to refine the limitations if it were to be applied to all TLD's. e.g. typo-squatting has to be accommodated for. I've been offered decent money for some domains I've held on to that were just catchy names, but I passed. AFAIK, this would not prevent me from selling one of my domains.