No bugs here.I rarely experience them.
Then you not really using the device to any extent.
Mail itself has about several bugs I experience every day including not loading messages in the UI and not executing rules for some messages. But then again I actually use mail as more than a toy and expect it to process 100s of messages per day. Same with other Apple software.
It is the same as buying a cheap Chinese lawnmower and having it crap out every year or two instead of buying a good American lawnmower that lasts for 15 to 20 years minimum. Apple software is cheap, foreign based, get it done for the cheapest cost possible. Just like that cheap Chinese lawnmower. Feel free to substitute any other cheap Chinese product if you don't understand lawnmowers.
Now you'll probably complain that this is software, not hardware, but Apple, for example markets Mail as Mail, the end-all, be-all. They don't say it is only good for 20 messages per day, even though they should. Because if they did, most users would go "Wow, that is not very good." Which is the absolute truth. Same with Messages, fail to delete them every day and watch how Messages and SpotLight search fall apart. Ohh, don't even bring up the complete failure that is Siri.
Don't get me started on how bad iCloud is at losing data, or how it is often impossible to restore good Time Machine Backups. BTW, if you are using Time Machine you should try restoring backups some time and check any critical files you expect to recover. There are certain types of files that will not restore accurately, period. Why because Apple makes sure your Pages document will restore, but not much else. OK, you're right probably also Numbers documents. But if you use your Apple device as more than a fashion statement, then you will run into problems with both iCloud and Time Machine.
And of course, if you are not real proficient in English then please note that these statements may be exaggerated in order to make a point. I don't really know if the mail message limit is 20 or 30 messages per day.
If you search the internet a bit you will find confirmation of everything I have mentioned here.