Hi Tony and welcome
You have hit the two points of the Ecosport that does cause concern to potential owners. I have had two Ecosports the pre-facelift 2016 and facelift 2019, they are great cars as they as manageable small SUV's, easy to drive and manoeuvre, used to be a good price new, but prices have risen like all new cars and not such a bargain now. I bought an ex-demo car in 2019 at a far better price saving thousands of pounds for a very low mileage car. There is plenty of room in the cabin, and a reasonable boot. Pulling power and on the move is reasonable with the 1.0 125BP petrol engine. fuel consumption is in the 40's MPG. Most owners go for that engine, including me. The problem with all diesel engines now, which is the other engine option, is that it must comply with EU6 emissions, so that means the complication of adblue and more burn cycles through the DPF filter. So is no longer the best to buy as expect more faults when older, even though MPG is better.
OK, the two points of concern...
The big blind spot, yes, it is there and they never learned when the facelift model arrived, as it was the same on the older model, but you get used to it, by bobbing your head back and forth around the pillar
Now the tailgate, it opens sideways instead of up, and again you get used to it, and its only a problem if some idiot parks right up against it. Plenty of room in the boot itself, and access is straight forward. One problem well known, is if you leave your keys in the boot, you shut the tailgate, and it can occasionally lock all the doors of the car leaving you stuck outside and no way into the car. This has happens to a few owners on here.
Other than that, the car is fine. All cars have things you don't like, but you have to take the pros with the cons, and decide if the car is right for you. Good hunting.