I don't think anyone has complained about BG3 not being like PnP, the biggest complaint is how much of a departure it is from BG1&2, and this is mainly from people that don't understand that the games are based on completely different rulesets.
For example I remember when I first stepped into playing games based on D&D 3 / 3.5, I went in thinking they would be like Baldurs Gate but was surprised to find them to be so different based on all the rule changes. Then I realized that there won't even be anymore games like BG1&2 because no one is allowed to make any more games based on the 2.0 ruleset.
I think all of this would have been much better handled if Larian and WOTC had made an official statement prior to the EA launch explaining as such that the game would be hugely different from its predecessors due to being based on the latest rulesets.
In relation to PnP vs cRPG, of course there need to be differences to make the experience better suited to a video game setting.
True, it is massively different from BG 1+2. Like, utterly unrecognizable compared to the previous games. So I think you're right, it would have been good for them to communicate just how big a gap there is between this and its predecessors in the series.
