Has anyone tried using a raspberry pi 4 as a Wi-Fi router? Any pros/cons that you would like to share? I am thinking of setting up something at the network level to selectively block websites (something like the freedom app or stayFocused). DD-WRT should do most of it but I was thinking if it was on a rpi4 it could be made more flexible to do timeout-based blocking.

Just install pihole on raspberry pi. You'll have network wide ad and tracker blocking.

Not using Raspberry Pi 4, but used to do it using Raspberry Pi 2 during college days. Pretty robust. Faced very few issues once it was set up successfully. A tip: Connect the Pi to a power bank and keep the power bank continuously charging.

Pihole is widely used right?

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Does pi-hole support time based access control? I guess dd-wrt does

Nope. Pihole only functions as a dns router. You can install dd-wrt on your router and pass the traffic through pihole. I've used that combo before without any issues. Time based access using ddwrt + ad and tracker blocking using pihole

It looks like people are already running dd-wrt and openwrt on pi 4, but the main concern seem to be with multiple devices and MIMO stuff since the wi-fi capabilities are limited comapred to router hardware

I used Pi Hole for a couple of months and often faced issues accessing several Indian sites (mostly banking and govt.) where they used cheap CDN which are often in black-list of popular ad-blockers.