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Saelorn It does give those as examples, however when it's defining what an object interaction
is it clearly states "If you want to interact with a
second object you will need to use your action." I don't know how more clear it could be, you can interact with one object as part of your attack
or movement, if you want a
second you need to spend your action, drawing one sword=one object, that second sword is a
second object. Therefore a requiring an action.
I'm not citing the list as what it gives are examples and completely unimportant when looking at the rule, I only quoted it so that we would have the entirety of it here.
It also covers that more complicated object interactions may by default cost your action. Basically the "object interaction" is much much less time than you are thinking. Keep in mind that it is
part of an attack or movement, running 30' drawing a sword, and doing 3-10(reaction included) attacks in 6 seconds is already pushing the scope of realism but doing that
and drawing 2 swords, sheathing one and drawing another, opening two doors etc. is clearly not what is intended. I understand how it seems unreasonable when I can easily sheathe two swords, draw them or switch weapons in about 3-4 seconds while standing still with relative ease. I definitely could not even come close to doing that while jogging(30' in 6 seconds is about 3.5mph), and attacking as much as when I wasn't.
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slaughterj
If it wasn't flavored as being part of an attack or movement then I would agree with you. As is I can't see someone putting a sword in their shield hand, opening a door Casting a Spell and then handing the sword back. Without the door sure. The timing also seems wrong for including it in the action. I am not questioning whether he/she has the manual dexterity rather if he/she has the time.
On lockpicking, not sure how old locks worked but modern ones open the door when you pick them, well they unlatch it at least.
On using thieves tools with your bonus action. Compare it to a rogue without that feature;
run to the door drop your weapon(s), pull out the tools, action to pick the lock. next turn put up the tools and pick up one weapon.
with the feature
run to the door, drop your weapon(s), object interaction to pull out tools, pick the lock, put up the tools with your action and move on.
if you only have one weapon this is even better as now you are done in one round, and the next round you can pull your weapon out
and attack whereas without you have to spend the next turn not attacking.
It's definitely not as simple as just using your bonus action but it is a definite improvement.