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I was searching the comments for this opinion. I think you are so caught up in details that you lost sight of the big picture. A simple ESP32 has enough IO ports to drive multiple sensors and a SPI display also possible. There are plenty of open source projects, firmwares, samples for IoT devices made with those chips (https://github.com/agucova/awesome-esp) Even the ESP8266 would work, but in 2022 I stopped using them for new projects. If I really needed to use an Arduino, I would turn the whole architecture around. The ESP is doing the communication and (REST) interfacing and it would query the Arduino (Mind the 5V - 3.3V problem). Sometimes it is just not worth reinventing the wheel.