dont worry about it....
that is large enough and will work fine
i started running a hot water 3/4 pex supply trunk this weekend. after i fed the home run to the basement i realized how small the ID of 3/4 pex is. i am a little worried it is too small.
i am planning on running 2 bath lavs, a shower, a tub, 2 kitchen sinks, dishwasher and possibly a washer and utility sink (they are currently served off one 1/2" line.
should i up the run to 1" or run a second feed? Should I worry about the temp drop from the h2o heater to fixtures? it is about 70 feet to the fixtures.