Yup, until they don't... I ASU-update a couple of my devices on SNAPSHOT at least weekly, plus on every kernel patch-version bump. Every now and then (maybe once or twice a year), something will change enough that things go wrong.
For one example, when the wolfssl/mbedtls swap was done, I had to figure out how to get a bunch of stuff working again. This was a transient problem due to me being "too early to the party", as the transitional steps were baked into the upgrade process (long) prior to the change making its way into the release branch, so release-branch users were not affected.
I don't consider this a problem as I'm well aware that it's part of opting in to using snapshots. The bottom line is: if you plan on using SNAPSHOT on your daily driver, you need to keep this in mind.
I did the initial flash with XMiR-Patcher, then flashed OpenWrt's U-Boot and finally flashed snapshot.
overlay is 75 MB (as mentioned in the wiki page) and the router boots in less than 30s, so I don't think I'll be messing with the bootloader again as I lack a device to interact with UART at the moment.
What exactly is better in ImmortalWrt's bootloader though?
As long as "all" doesn't include me, that's fine. Oh, and also except for the users that test work I do only on the main branch, I'd like for them to continue using snapshots.
I just change ch to 149, enable 160mhz on my main MX5500, install relayd package on my second mx5500 and connect them together. Didn't setup WDS nor 802.11s mesh. There wasn't any files behind transfer and since I was testing, they were 4 ft apart.
Now the Xiaomi AX3000T is even cheaper due to some sale period on Ali. Using the marketing code 11CD03 , the final price appears as 32.77 EUR for me, including tax and delivery to the EU.
Very interesting option for the Filogic 820 at this price.