Reading Nick's comments I was slightly surprised that our Florida club did not seek comments from us before responding. In principle we probably all think road users should help pay for infrastructure. We also know that there are explicit and implicit incentives for gasoline stations and petroleum infrastructure.
However, a large however, the Florida State gasoline tax is 42.3 cents per gallon (~14% at a price of $3.00 per gallon), . Again however, the Florida State electricity is subject of sales tax of 4.35%.
Dispassionately we must agree that EV's pay much less than do ICE. As public policy that makes sense, but politically the situation differs. Florida licensing is among the world's cheapest by any measure. Adding any of the proposed prices to EV licensing still has much cheaper fees than in most worldwide locations including many other States in the US.
The Senate Bill 140 and House Bill 819 are both seem quite appropriate, in my view, because they specify the funds go to the State transportation Trust Fund. So, what is that fund? The three largest expenditures are, in order, Construction, Consultants and Miscellaneous. The there largest revenues, in order, are Fuel Tax, Federal Aid with third shared between Tag fees and "reimbursements'. As usual the financial information raises new questions, that are not easy to clarify.
Still, the only changes that could make these fees more equitable would be some form of progressive fee. In reality almost nothing in government fee structures can cope with that issue. Typically, as in Florida, such issues are dealt with, for better or worse, with tax exemptions and/or rebates. (e.g. Florida Homestead exemption, itself with a very modest flat exemption ). Any such modification is not likely to be very workable in Florida.