>>11205044Troubleshooting and design. They allow you to simplify swathes of circuitry and give a clearer idea of what measurements you should be seeing, what power supply you need, etc.
Used right, they save work, is what I'm saying.
>>11205037Speaking as someone who did this: NO. NO NO NONONONONO.
NO.
2 year is BAD. 4 year is GOOD.