I don't think the annoyance is directed specifically at Tesla; rather, its directed at the fact (for whatever reason) that the I10 route (along with the I40 route) are still incomplete, making travel from the East coast of Washington, D.C. or Florida, to Arizona very difficult.
I bought my car in 2013, indicating to the Tesla personnel at that time that I wished to do a trip from the D.C. area to Arizona in the car. Every Tesla employee I spoke to assured me I would be able to do this via the supercharger network by the end of 2014. We are now mid-way through 2017 and these routes are still not complete, so I've been patiently waiting and waiting to do this road trip.
Last year I was diagnosed with cancer. Had surgery and pre-operative and post-operative radiation treatments. I can not continue to wait longer for these routes to be completed, so I am going to make this trip next month while I am still able to, not knowing what I will do to charge in the "zones" where there are no superchargers.