Electric motors have fewer components and less wear points than gasoline motors.
Lots of electric motors are still good after decades of service.
Pro-electric car here.. however, the category of motors is very different.
Your pool motor has a relatively low horsepower rating, only accelerates 2 times per day (one positive, one negative), and has a very well defined load envelope.
The induction and permanent magnet motors used in electric cars are a different beast. During hard acceleration, over 400 hp, mechanical, is developed by a very small induction motor, that cannot possibly shed the heat continuously, generated by various losses all motors are subject too.
Tesla motors do have liquid cooling, but the waste heat generated has to be carried away. Welcome to limp mode.
Additionally, there is the stress of being driven by an inverter. No matter how well designed the inverter, or the motor, there are harmonics developed by interaction of the inverter carrier signal and the actual drive frequency being synthesized for the motor’s input.
This is why if you dig around in Tesla forums, motor replacements are not uncommon. Worse than gas/diesel replacement? No idea from here.
Gasoline motors over the last 2 decades, at least from the big 3 and the Japanese manufacturers, and Korea, can sustain long full throttle runs (under load, not just spinning free at high RPM), and hundreds of hard acceleration cycles (also fully loaded). We just have gotten good at the art.
BTW, a industrial 400hp motor that is equivalent to your pool motor (400hp mechanical output, continuous), would weight 2400+ pounds. But the power output is rated *continuous*.