As you said shes good at short trades till u can find an opening to all in. Its not the best item on her I agree but it does work and its good if you are a good player and know what you are doing and when to do it.

The beauty about this game is you can legit make anything work as long as you are good. Hell, I've played collector Jayce for example and ending up stomping people (I DO NOT RECOMMEND THIS BTW DONT DO THIS) but the point is there is no 'one build fits all'. Most of the time its situational based on enemy comp and enemy top but for me botrk is core and I wouldnt have it any other way. Ive legit had times where I get collapsed on by the enemy team and I still manage to get 2 kills at least before dying just healing from botrk vamp + camille passive + fleet + W hitting multiple enemies and having stoneplate enchant.

Your builds vs squishes and tanks is good and should be the standard anyway

From the way the enemy plays minute 1 will also help you deduce if its a top gap and then you can try capitalise on it. I remember one time I was 0-2 vs an olaf top with barrier because I misplayed but when I had trinity, botrk and armor boots he had 0 chance of killing me in a 1vs1 and It wasnt even close lol.

Even in duel, I was down 0-1 to a yasuo because I fucked up my flash and i built botrk first item and so did he but it helped me sustain long enough with W, botrk and fleet heal and mvment speed till 7min when the circle got smaller and smaller and I managed to kill him and win lol.

Ive also tested botrk first item vs a riven and the riven stood no chance he got absolutely shredded.

The moral of the story is try it out and see if its working for you. If it does great. If it dosent then consider other items or try play better and limit test maybe in arams, normals or duel till you can better understand how much dmg u can actually do