I feel everybody is pilling up on the OP but he brings a few valid points.
You got to be efficient and start early (or finish late I guess) if you want to do 4-5 dives a day in Bonaire... or anywhere else! Most liveaboards I've been to with that kind of schedule had you up really early to start diving. It's a bit easier on a live aboard since you don't have to deal with food or fetching new tanks, and very often you don't even need to switch tanks for a week.
Food... well I love to cook, and we usually rent a house/condo with a kitchen and a grill so we can cook our meals, and make wraps/salads/sandwiches for lunch. But this island is really in need of an efficient take out sandwich place, and yeah, dinner can get expensive if you eat out all week (it's not cheap and delicious food like Thailand).
Trucks... I think people are freaking out way too much about the theft thing, we leave lunch in a soft cooler all the time in the truck and it never got stolen (nobody wants your lunch). But at the same time I really resent not being able to pack up a real save a dive kit (spare parts, batteries + tools to fix common issues), at least it's usually not a very long drive to go back to your hotel/condo/house/friendly dive shop and fix the issue. Still annoying.
Dive sites... on the west side... yeah it's pretty similar slopping reef with some variations in coral species, sometimes a bigger sand area, or a double reef. Some sites offer variations like the salt pier, the hilma hooker, la dania's leap (a wall!!! but really, no leap), cliff with the small wall, karpata with the sand channels. It's not all the same but the topology is very similar, and the fish life is also similar from site to site (or island to island in the Caribbean's, not all the same but similar). Topology wise the cool stuff is on the east side, but it's also a lot more complicated to get in & out. If you're looking for fishes all that doesn't really matter that much, it's about being there often and looking, the wildlife doesn't just stay there, a few dives on the same spot will yield different things. It may be the same dive site but it sure is a different dive.
Tanks/Dive shop... if you're worried about when the shop closes or how many tanks you can take, well.... all I've got to say is that you're diving with the wrong op. We had 24/24 access to tanks (nitrox) and it was fine like that. But I can totally see it as a bummer if you had to be there by 6pm to swap tanks or wait till the next day.
I like the place for the freedom, for not having to abide by a schedule, for not having to dive with a guide or with other divers I didn't choose to dive with, for not having to spend a week on a boat and for not having a 12h time difference from where I live with 2 days of travel time to get there. There are other ways to get those things but Bonaire is a good option if these are things that matter to you.
I wish it had the awesome corals of Raja Ampat or the good muck diving of Lembeh, or even just a more varied topology like Cozumel but that's just not the case.