In most jurisdictions the taxi companies have been subject to more rigorous (i.e. expensive) standards than Uber has been following.
...because they paid good money to write those laws. Taxi laws are a prime example of regulatory capture. For example, Company A got a sweet deal on credit card readers and they spent 2 years installing them in their cabs. Then, they tell the local regulatory body that credit card readers are a necessary public good and suggest that all taxis should have readers installed in a reasonable time frame - say, within three months. Finally, they laugh as their competitors scramble to shell out inflated prices for emergency rush orders on credit card readers so that they can stay in business.
For another example, three companies get together for group bargaining with an insurance company: "if you give us a good rate, we'll guarantee that all of our cabs will carry your new expanded coverage." Once that deal's in place, they ask for regulations to require all taxis to carry that level of coverage. Of course, all other companies have to pay the un-negotiated rate and now they have a harder time competing.
You don't get to write the laws and then bitch about them. Well, apparently you can, but you shouldn't be able to.