TL-R605 vs OpenWRT

Hi guys! I haven't used OpenWRT before. I want to buy a new router. Would there be any downside of buying a Pi 4 and running OpenWRT on it (with a usb to ethernet adapter or smthn), connected to an LTE modem and a 24 port switch on the other side, versus something like the TL-R605? I don't need wi-fi or extra ports as you might have guessed.

I only see upsides, no?

Am I missing something?