Sorry but you are being reasonable, and nastily judgemental, @DrunkPosting.
Most venues have a maximum headcount, and most people have a maximum budget for their reception, and either or both of these factors may make it difficult to include children.
Dh and I were invited to a child-free wedding - and the groom was godfather to one of our dses. They explained that the venue was limited in size, so they couldn’t include the children of all their friends - they had to choose - either include children, and then they wouldn’t be able to invite some of their adult friends, or make it child free, and have all their friends there - and we understood completely.
We have also been to weddings where children were invited - and both sorts of wedding are great - and both have advantages. At one wedding, Dh had to whip ds1 out of the church because he was being noisy, and we weren’t going to let him disturb the service - but accounts on here from other MNers demonstrate that not every guest with children is that considerate - I’ve seen too many stories of oblivious parents beaming round as their offspring run riot and drown out the ceremony, spoiling it for the other guests and the happy couple. Children can add to an informal,atmosphere, but a more formal ceremony may not be suitable for younger children (unless they will behave, or they are removed quickly if they get noisy).
Going to a child free wedding meant we could relax and enjoy the day, without having to constantly run herd on the children.