Sure you can setup a “low budget” reef, but the difference is extremely clear:
Sorry I love your tank but you don't need any of that stuff to get a beautiful reef tank. In fact I would say that in a lot of situations "too much kit" makes things more difficult. More below...
Why? A well built DIY stand will almost always be better than any store bought stand. You can build to spec, you don't have to try and fit your equipment around your stand, you can build your stand around your equipment.
Having used both, DIY stands where a LOT more accessible and useful than any prebuilt stand I used.
You can create a beautiful reef tank with just:
Tank
Powerhead(s)
Heater
Light
Salt, test kits, RO/DI water
Careful selection of stock (most important part)
Lots of hard work.
You don't need a sump, you don't need dosing pumps, you don't even need a skimmer. A reef tank that is lightly stocked with fish, using a decent quality salt, with regular water changing/manual top ups and selecting suitable corals is very doable.
You have to make sure you have good quality salt and do enough water changes to replenish anything that is getting used and remove nutrients. But if you have a light fish load and don't cram the tank with SPS corals you can do just fine. The important part is not letting nutrient levels get high and keeping your calc/mag stable. Regular water changes with a good brand of salt in a lightly stocked (fish) tank will do that just fine.
The biggest issue with reef tanks is normally Phosphates and nitrates. If it's lightly stocked and you do a decent amount of water changes then you don't need anything else to deal with them.
A sump helps as it gives space for equipment and more water=more stable but I have run softie/LPS tanks without.
A skimmer is great for nutrient export but again I have run reef tanks without them.
A refugium/algae scrubber are IMO even better for nutrient export than a skimmer and are cheaper to set up as well (can literally use a cheap HOB filter with a light).
All the bluetooth/wifi/computers/sensors doesn't actually do anything to make your tank "better". It may arguably make it more stable by giving you easier access to water parameters but it's not doing anything that the right test kits wouldn't do.
The example you gave for remote accessing your tank and adjusting flow for example. In theory, sure sounds great. In practice if your having to mess about adjusting your flow when your not even there then your tank is not set up correctly anyway and you are doing it wrong. If you tank is correctly setup and stable then you shouldn't have to be messing with stuff like that "on the fly".
The only exception to that I would say is temperature controllers. Having lost a lot of livestock to a faulty heater I consider these a must have. You only need something simple and reliable though.
Pretty much every other bit of kit is just about making things easier/quicker/prettier. If you aren't doing the basics right all the equipment in the world is not going to help you. In some cases it might end up masking the issues. For example you could get away with overstocking or overfeeding with a big skimmer attached. However a better approach would be to not be overstocked or overfed in the first place.
Even things like Sumps, skimmers, phosphate reactors, calcium reactors, refugiums, etc can be DIY, often with stuff that most experienced fishkeepers already have to hand. Being expensive doesn't make it better, prettier maybe, but not better.
The only exception would maybe be SPS heavy tanks where you need you nutrient removal to be as overkill as possible and want to encourage growth with dosing.