True. But I still think Aikidos attacks (at least in most of the demos I have observed) are more stylistic than most.
From what I understand, Ueshiba Sensei based the attacking rythms of Uke on sword cuts, most obviously a straight cut down (known as Shomen Giri, or Ten Chi Giri, or by about 5 or 6 other names that I have heard), and that is why the attacks are often a hand edge straight down with a step (to align the same hand and foot for a commited action). This action is obviously the primary one used to learn the basic movements and techniques, afterwards, of course, you apply the techniques and principles against a much wider range of attacks.
In terms of "realistic", and how you can find difficulties applying that to most Martial Arts, yep. Not really realistic at all. Won't work, don't try. Although...
You need to remember what the techniques are based on, and what they are designed to work against. Classical Aikido techniques against typical old-style Japanese attacks, and it'll work incrediably well. Against modern jabs, hooks, kicks etc. the techniques need to be modified, but the principles are timeless, and will be just as effective, powerful, and realistic provided they are trained as such.
To balance that out, though, boxing nowadays is a very good way to get a lot of practical skills at hitting and being hit, but if we go back even to the time of Aikido's origin (early to mid-20t Century), the "fisticuffs" old-style of boxing was what worked. These days, if you adopt an "old school" boxing pose, you get laughed at. Try it. Honestly, try it! But if we look at what it was designed to combat, you realise that boxing in those days included the ideas of grappling, and a great deal of "dirty" tactics, and the high, extended guard of the old posture is designed to keep the opponent at a distance so they couldn't grab you. So, it is very realistic, if you keep in mind the context and principles.