My bias is to stay in the point system and not use II with your points. Now, that's just my opinion. Others clearly have been able to use them and have wonderful exchanges. I rarely use my points for Friday and Saturday stays which saves me almost half of my points while only losing two nights. When I combine them with II exchanges for a 12 day stay, I usually do so with a studio or 1BR plus the points. This summer I'm staying in Hilton Head for 12 days and used a 1BR and 5 destination clube points. Total cost in terms of maintenance fees are about $2000 give or take. The rack rate at Grande Ocean for those 12 days is about $7200. The 1750 points for 5 nights comes out to almost $1.7 per point. That's pretty strong.
Again, I'm not trying to rain on other people's parades. I use a non-Marriott trader to get exchanges outside of the Marriott system.
Yep, 12 night stays are a wonderful use of points. No doubt, we are so tired of 1 week stays and not going to buy twice as many weeks for 2 week stays. Even better, where possible is those extra 5 days on points non weekend nights with within 60 days discount using puck trick. The 5 nights of points stays are often cheaper MF wise than the weeks portion. From the point of view you have explained, totally agree with you.
For me, I don't want to pay more MF, so, not getting more weeks to trade in II and while I am sure it's cost effective, don't want non Marriott weeks either. I have enough things to try and keep up with so don't want another system no matter how easy. And I do want them enrolled in MVCI. YMMV. So, cheap points studios deposited into II to trade are a good compromise that can also be pretty cost effective. Just depends on the year and what else we are doing. Sometimes, we are unable to get into a resort we awnt to go to with II, so, sometimes we spend points to get in. For those years, wouldn't have enough points for making very many deposits. Other years, we are able to get everything via exchanges, bonvoy, or getaways, so, can pile up some studio deposits via points. As I am logged into II daily, it's really a blast for me to be trading into places all over the world.