I wouldn't recommend preheating PLA. I print old PLA all the time. Some brands will get brittle if you leave them unspooled for a day or two but only the portion of the filament that was unspooled. It has to do with the mechanical stress of straightening the filament. I think it probably gets microcracks which simulates brittleness.
I'm not sure if your parts are typicall of what is expected or not. But I think your printer is probably working fine. Not certain but it looks okay.
Did you order a new sensor or heater? More often it is the sensor the breaks but it's possible for the heater to break as well.
Just my luck, received a nozzle temp error today.
Ordered a new one off Amazon, we will see if this was related.
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