to the OP, besides the one snarky commenter talking about bottling buckets being outdated, most everyone who bottles from the primary fermenter will usually admit it's not the best practice. why? the reasons mentioned above:
1) you will have a much higher chance of uneven carbonation
2) you will inevitably stir up more trub and yeast cake than you would using a bottling bucket. reason being that it will settle back out in the bottling bucket.
3) it is much easier to bottle using a bottling bucket with a spigot and a hose or bottle filler than siphoning from your primary, a lot less mess, less potential to spill once you get the technique down. etc. it may be another bucket to clean, but really how hard is it to rinse out a bucket? it's only been in contact with the beer for a small amount of time. you don't need to go into any intense scrubbing or anything.
4) you have just as much chance of oxidizing your beer trying to siphon out of primary into bottles as you do siphoning into a bottling bucket. i would even argue that you have more of a chance, depending on your siphoning technique into the bottles.
i used to bottle from the primary, or siphon into my boil kettle in order to get the priming sugar mixed in really well, then siphon out of that. it was a mess. i'm sure i introduced oxygen into every bottle because the only way to do this was by using two funnels side by side and switching out the bottles underneath. i could've used a clamp on the hose, but from what i've seen those are a bit harder to get them to stop exactly where you want them. so this method always took two people. one controlling the siphoning hose, the other controlling the bottles and the funnels. then after we got it all into bottles, we could start capping. now i can very calmly transfer into my bottling bucket. sit and relax and have a beer and chat with my brewing partner. then when it's ready i can calmly start bottling while my buddy starts capping. if i need to take a little break in between, no big deal as i don't need to worry about getting the siphon going every time i need to take a break (i.e. another contact point with more bacteria). if i had to, i can even bottle on my own now. practically no splashing going into the bottling bucket. no splashing into the bottles. i can still cap them immediately if i'm on my own. so then it's less contact time with open air.
now i know people will critique my palate when i was a complete new beginner, but i had people drink those beers that tried all kinds of craft beer from around the world, and immediately began requesting that i sell them beer! so then you gotta question experienced beer drinkers' palates as well. the thing is, i'm usually drinking my beer before any damage can be done by oxidation. and these were even on hop-forward beers. they still had great hops flavor and aroma. so the thing for me that bumped me into the bottling bucket camp had nothing to do with oxidation or even contamination (i'm pretty anal retentive about sanitizing everything). it had to do with the ease of use of a bottling bucket. it just made everything so much calmer and smoother.