Thanks for the reply, Stax! So it's fine for 1/2 supply line to feed 2 bathrooms (2 sinks & 2 showers) and another to feed shower, toilet, 2 sinks, and washer? Mind you these 1/2 lines are not coming from the 3/4 directly, they're coming off a 1/2 line that is coming from the 3/4. Is there not a concern, more specifically for the showers running simultaneously?

You'd be amazed at how much water a 1/2" line can supply. I made a mistake and ran 3/4" to my kitchen which was quite a ways from the water heater. It took twice as long to get hot water, and even after removing the restrictor in the Moen faucet, the flow was just so-so. Modern fixtures combined with only using one fixture at a time: I think you're fine.

Forgot to mention, when this was redone, the piping was done outside the walls in copper. When I redo them, I'll be putting it into the walls so I'll likely be redoing this with PEX A. That's the reason I feel as though I should be branching off the 3/4 with a 3/4 then feeding whatever fixtures with it's appropriate size. I'm certainly not the expert and don't want to seem argumentative but every other site I've read on says that the 1/2 branch that feeds multiple 1/2 bathrooms is too small. Also the master bath shower will have two shower heads.

Yeah I hear you seabornman, I imagine that since that 3/4 run to the kitchen was long, there was a lot of cold water that needs to be cleared out first. I have that same issue today. Thankfully the bathrooms are all rather stacked atop of the lines so the runs would be short. Thoughts? I essentially just want to separate the master to have its own 3/4 so that I can do toilet, lav, dual shower heads. Then I want to branch off the lav and washer from the other bath.

You are wasting angst and money on a problem that doesn’t exist. Leave your pipes alone.

Thanks for the opinion here. There's a problem in the fact the piping is run outside of the walls so at the very least it's unsightly, it's leaked in other areas that have been fixed so I'm trying to get ahead of that again. Something will be done, the only question I really had was should a 1/2 trunk line be feeding several other 1/2 fixtures. If it's being redone, why not go bigger? What's the rub here that I'm missing?

I use the lower level bath a lot. the utility room is in next room. i had 24’ of 3/4 and 1/2” feeding the sink in a meandering loop. i made a new 1/2” line that is 12’ and run directly to sink. much shorter wait times for hot water.

thanks for that @stoveguyy, soundsl ike your runs are direct to fixtures?

Thanks @stoveguyy similair to what i was thinking!