You're probably fine without these, but the motion plates make the trainer better to use. And regardless of how poor of a value it is to pay over $200 for some plastic feet for your trainer, you'll most likely never want to ride without them once you set them up. They make the experience on my 2T a lot more enjoyable. To be frank, I think my nether regions hurt less with these installed. My biggest gripe is that they are only connected by some relatively weak magnets and will fall off easily if you try to move or fold the trainer with them on. I've also seen reviews saying they don't do well for sprinting...haven't tried it personally, but I've done some standing efforts on hill climbs and they do just fine.
The best cream you can use to prevent chaffing and rubbing to the inner loins that grip your saddle on long days where sweat and salts by friction rub you as raw as a newbie on Cell Block 6! This stuff imparts a cooling menthol type feeling quickly upon application but dissipates very fast. I apply directly to my skin rather than rubbing on the chamois pad like some do or at times, the manufacturer suggests. Truly a needed product just like supplements for any cyclists. So do yourself a favor and buy a jar today.......a little dab will do you!
This product is a cream for your "private" and/or "tender parts" that protects against chafing from cycling shorts and chamois particularly where the inner upper thigh joins the torso (about as graphic as I care to get). It works as advertised for me. I am a casual cyclist and my rides are typically less than three hours. As this product is water soluble, heavy use and sweating may necessitate reapplication. I usually put a nice blob (tablespoon ??) on each thigh/leg joint area (but not on chamois -- my choice). It works for me and prevents a pretty large "stretch mark" on one leg joint area that can otherwise get rubbed raw. Washes off easily and completely in the shower and doesn't stain any clothing (like the chamois).
Yes, there are cheaper creams out there. But this one is thick and you don't have to use as much of it. This thing stays on your bits for the duration of your ride and it will keep you comfy and pedaling. Buy this.