Point 3 is a really valid one for all-day, all-weather riders. The BMW suit I use at the moment has great double cuffs to get the glove between and a built-in, very high, storm collar with integral thin cotton 'hood' to keep the collar up under the rim of the helmet. Totally weather-proof.......but
If it is raining, or it is forecast, when you set out, then it all works perfectly. However, if you have to stop to don the thing when it starts raining unexpectedly, then you either get a wet head taking the helmet off to make the collar watertight or you don't bother and just snuggle the collar up as best you can whilst trying not to get saturated hands to go inside your lovely waterproof and thus far, dry gloves
The other thing to look for on a suit is trouser bottoms which open to the waist(ish) so you can get them on over your boots without falling over doing the dance of the drunken spider.
Brian (who insists the waterproof and breathable suit has not been invented and as far as his perspiration goes, never will be
)