Obviously no judgements if circumstances mean swimming is impossible/a health risk etc.
If not, I would say it's sad, and think the dc is missing out.
Swimming is an important skill, and I don't think you can compare it to going on a trampoline or a slide.
I personally hate putting my cossie on and getting hair wet, but take dd often.
Parenting sometimes requires me to take part in things I absolutely dislike,but feel is important for dd.