It's not a realism issue. It's a technical issue. Maybe they'll be able to sort it out one day. But if not, it really isn't a big deal. I think the problem for most people is where they have their Man Form and Bear Form buttons, and how easy it is for them to use those buttons during play. I have it set up in a way that is very easy to use:
1- There is an option to enable or disable BEORNING SHAPESHIFT BAR SWAP. It is enabled by default. Keep it that way.
2- In Bar 0 (which is the bottom-most horizontal skill bar) put BEAR FORM in the left-most quickslot. I have that bound to the 1 key on my keyboard.
3- In Bar 1 (which is just above Bar 0) put MAN FORM in the left-most quickslot. I have that bound to F1 but it doesn't matter what I have it bound to because I never use that keybind nor do I ever click that button.
Set up like that, if I'm in Man Form, all I need to do to switch to Bear Form is tap the 1 button. And if I'm in Bear Form, all I need to do to switch to Man Form is tap the 1 button. Switch form, no matter what form I'm in? The 1 button. (I also put Slash and Thrash in the same vertical column, because they'll trigger each other's cooldown and will each cause your Beorning to change form if used in the incorrect form; not really pertinent to this discussion but just thought I'd mention it.)
Even if every object interaction is adjusted so that everything can be "used" in Bear Form, you still won't be able to use your mounts or take stable rides in Bear Form. So make it easy on yourself. Besides, in any spec other than heavy Blue you really ought to be switching forms regularly to get the most out of your skills.
Changing form is just another skill. Treating it as if pushing that particular button causes you pain like poor 'ol George as the full moon rises is something I don't understand.
Your character is not a bear; it is a Beorning. Bears are bears all the time; Beornings change form between Man and Bear.