I also would be, if there were not some annoying bugs. Like external display flickering after waking up from sleep (interestingly, not when cold booted). Sometimes reconnecting the cable fixes it, but it is still an annoyance.
I have my problem with OWC TB3 dock and Dell P2715Q. I will try an older dock that I have in the office (Kanex TB2 Express; as the name says, it is TB2, thus extra dongle needed); but playing around with different TB docks can get expensive...
It also does not happen with Intel Macs, which use Intel TB implementation. With M1, the TB is brand new, so some issues are to be expected. I suspect that with sleep and wakeup, there is some state mixup with previous link training, so it doesn't talk to other side the way the other side expects. This might be - or might be not - fixed with firmware updates.
This might be the one: https://support.apple.com/en-us/HT204450
No, OWC Thunderbold 3 dock and Dell P2715Q.
I also have older, 2015 Macbook Pro, with Thunderbolt 2 and Apple TB2->TB3 adapter, connected to the same setup. This laptop does not flicker.