But then again, most homeowners would rather not have their property burn down due to an electrical fire either. It all depends. If the landlord flat our refuses, I think I'd try to find one that was more accepting of the responsibility to maintain the property and my safety.
I still don't see the $4K cost. Just for fun, I ran the numbers on Square-D Homeline, shipped from Home Depot.
1 $104.93 40 circuit panel (20 spaces) 200 Amp Service HOM2040M200PC
10 $4.10 20 Amp breakers HOM120CP
2 $9.62 50 Amp 2-pole HOM250CP (includes a new 50 amp for the Tesla)
1 $9.62 20 Amp 2-pole HOM220CP
$174.79 Total
My guess is LA Country code would not require CAFCI on house this old. If you want to move to a full-on 2020 code compliant box with whole home surge supressor:
1 $104.93 40 circuit panel (20 spaces) 200 Amp Service HOM2040M200PC
10 $41.65 20 Amp CAFCI breakers HOM120PCAFIC
2 $9.62 50 Amp 2-pole HOM250CP (includes a new 50 amp for the Tesla)
1 $9.62 20 Amp 2-pole HOM220CP
1 $76.33 Square D Homeline 50 kA P Whole House Surge Protective Device HOM250PSPD
$626.62 Total
Labor would be three hours max. Looks like $100 per hour is the going rate in LA.
Add $100 for a Hubbell 9450a NEMA 14-50 receptacle and box installed at the panel.
I'm guessing $150 for permitting and inspection.
Even with the more expensive CAFCI breakers, with labor, permitting and 14-50 receptacle, you are still under $1,000 and NFPA 70 compliant for NEW constriction. This isn't a difficult job.
You are in Texas. parts cost aside, I am betting the cost would be at least 3k out here for any electrician to do that work, just about anywhere in california.