From my experience the best Aikidoka are strong some very strong - but !
They have a very developed sensitivity,
some are very strong but have no sensitivity
and they scare the s... out of me because I can not give them my body without worrying about serious injury and thats not a recipe for good Aikido.
Strong technique is not forceful,it is simply strong by being relaxed and having all the elements of maai,timing,focus,breath and all that takes time to develop.
Relaxed shoulders are very important for correct technique,so too much lifting can affect this.
Nonsense - you be the judge.