As a mikrotik enthusiastic and network engineer since 2012 i have setup hundrends of clients with routerboards. I like mikrotik because it has all networking options to touch and configure. Well at 2020 i cant even make a simple pppoe bridge and some bugs which make some configurations to stop working after an upgrade made me to loose days and nights at hotels due to network down which make me consider moving to ubiquity. Less headache less pills at least no failures and everything works out of the box with least configuration. All these years i have invested over 10k euros on mikrotik products so far all good but it is impossible yet to bang my head on the wall because after an upgrade something stops working or because of a bug or change of default configuration. I’m too old for this shit.
I’ll look forward to reading your complaints on the ubiquiti forums.
Did you make any report to support? Please, share your ticket number I will check what is going on there.
Your single other thread here is on another topic. So, you can’t make it work, but you haven’t sought help. Do you want help?
some configurations to stop working after an upgrade
That is certainly annoying, but if you believe only MikroTik does this, you must have led a sheltered existence.
Why do you believe that Ubiquiti in particular will never do this to you over the same span of 9 years?
Which configuration(s) failed for you in particular, across which RouterOS version boundary? Was it documented, or did you have no option but to stumble upon it blindly?
made me to loose days and nights at hotels due to network down
So you tried a remote network upgrade without checking it in a lab first?
Network equipment firmware isn’t like other software: we need the network to fix the network, so we can’t do things to it that will lock us out. Thus the concept of “labs” where we test things out before we deploy them remotely.
everything works out of the box with least configuration
Perhaps so, but if so, with less flexibility. Will you lose features you require? If not, then bon voyage. 
something stops working or because of a bug
Only MikroTik has bugs. It is known.
change of default configuration
Once again, set up a lab representing each actual configuration in the wild. After each upgrade of the lab equipment, diff the /export output and find out what all the changed elements mean before you deploy it.
Have you invested in any training, as in Certifications for MT networking?
If one is going to spend that much money and have customers relying on your work… it would only be smart to actually know what you are doing.
A quick survey of decent help…
https://www.youtube.com/watch?v=bhSPC-bVY1g&t=1092s
http://forum.mikrotik.com/t/using-pppoe-without-a-bridge/87277/1
http://forum.mikrotik.com/t/pppoe-server-bridge-with-other-interface/153170/1
http://forum.mikrotik.com/t/pppoe-client-and-bridge-port/29969/1
https://www.youtube.com/watch?v=osUseT7zdoQ&t=63s
https://www.youtube.com/watch?v=8SH3BUAtBus
Alex, I’ll take “Thing’s that didn’t come from a network engineer for $1000”
“The Greatest thing about UniF–k, it allows people with no F–king idea of what they are doing, to deploy networks.
The Worst thing about UniF–k, it allows people with no F–king idea of what they are doing, to deploy networks.”