The Apple provided tools are the ones used at first party Apple stores to perform authorized repairs. At some point, some bean counter tabulated the cost of building X000 machines and shipping them across the globe for a marginal increase in repair quality and deemed it a worthy tradeoff.

If you want to repair phones to the equivalent quality of Apple stores, Apple makes it possible via their "overengineered" machines. There's nothing in Apple's ToS that forces you to make repairs this way, you're welcome to buy the Apple genuine part and use your own heat mats and press and whatever and knowingly make that tradeoff.