This has been cited as a risk avoiding strategy for some years now, it is a block to progress on the Everyone front under the threat of fear of unknown. Result: as @Dimitar points out above only 17K addresses, and we are about to head into launch with no way to get tokens into the hands of users until some indeterminate point in the future after SN launch and/or based on the goodwill of third parties something which you cite as wanting to avoid, (and I agree - ERC20 or similar removes third party risk not adding more!). Most alternative proposals like Mechanical Turk DEXs, CEX bucking trends and listing SN Tokens have been hand waving about some long off possible future. That was ok when there was not even a testnet, but it is a much harder sell now.
ERC20 or similar move in addition to keeping Omni passes the Two Way Door decision test. Simple, concrete, actionable, low risk and reversible:
