litvishechossid,
“Avram- it’s not 5 pages extra.”
I didn’t say it was.
“Flipping one page is much easier than 100.”
Sure, and maybe the difference for you is such that you’d rather flip the page 5 times a week to avoid the big motzei Shabbos flip. That’s reasonable, and by all means use a siddur that includes it in the weekday maariv. I stand by what I wrote before. I’ve used siddurim that include it and don’t, and I personally prefer the latter.
“I know that they may have wanted to make a special section for motzei shabbos, but also including it in maariv as well would not have made the siddur that much thicker. If that’s too much they could also take out ashrei in mincha and just force everyone to flip to the ashrei in shacharis. No need to waste pages with duplicates.”
Artscroll and other siddur publishers do their best to reach a balance between avoiding thick tomes with the same tefillos copied multiple times and minimizing page flipping. Neither can be completely avoided, choices have to be made, and not everybody will be pleased 100% of the time. If having vihi noam between kaddish and aleinu is super important to you, and you can remember that by motzei Shabbos it’s a half kaddish and not a full one before vihi noam, and then you do a full kaddish afterwards, and you don’t mind not having havdala right there – all things that you get explicitly by Artscroll using the layout it does, then by all means use a siddur that puts vihi noam there. I personally would rather see the half kaddish and full kaddish spelled out and have havdala there too, and don’t mind flipping to the end of the Shabbos davening section to get it.
Do you get upset that you have to flip from the morning brachos to the Shabbos pesukei dzimra every Shabbos morning?