Personally, I agree that some practitioners do not tailor their training in such a way as to translate into combat. Although that is not "my" way of seeing things, I do respect their view, and have learned many things from them in spite of myself.
I suggest that your view of what constitutes effectiveness may be limited by the insecurity in your own skill you experienced in the face a novel approach to "attacking" you. I think that leaves you two options:
1. To integrate these novel attacks into your training
2. To expand your view of aikido technique beyond the "combat", aka "my sensei can beat up your sensei".
I am told that ideally, one should do both. No matter what you do, train.