No worries

t’was just a thought. I too have got a kick from having new gear. That said, I have had five premium packs second hand and only one had a problem, and was sold on at no loss. Three second hand tents that have all been good, and some other bits of gear.
I fear you will need to compromise on something.
Strength and durability overlap, but are different.
Durability means it will last well, for the weight of materials used (weight as in fabric grams per metre square). A well made tent using heavy material should last longer than an equally well made tent of lighter material, if the materials are equivalent (some nylon is stronger than other nylon even for same weight). However poorly designed and constructed tents of heavier material may fail faster than better made lighter tents.
Durability is quality materials sewn together with enough stitches using strong enough thread, finished so it stays stitched, with adequate reinforcement…etc.
All of which generally costs more.
If it is inexpensive, light, and high quality, something unusual is going on with how it’s made (someone somewhere isn’t getting paid the usual rate).
Strength is helped by quality materials and construction, but also brings in design. For example, “strong” tents are designed to shed or withstand higher wind loads. Often by more poles, and how those poles are connected to the fabric. Tipi designs can be good in wind too.
Light weight strength costs more.
Hilleberg make superb tents, but not the lightest and not the cheapest. Think 6x your budget, but they share good info to bear in mind.
There really is no "best" Hilleberg tent for you, but there is a "right" one.
www.hilleberg.com
Seek Outside are a very different maker, favouring floorless shelters, but also share interesting info. Their tents are used by hunters in poor weather.
Why Floorless Tents are awesome, and how to overcome the potential pitfalls.
seekoutside.com
4 season should withstand wind loads better than 3 season, but 4season also means it holds warm air better and protects against spindrift ingress better with a lower to ground fly, higher bathtub floor, less mesh and more solid liner. The trade off tends to be less ventilation and breathability. None of that on its own means it will last longer.
Three person tents are snug for two with a little kit. Shelters are sized on the number of human sardines that they can fit. On a winter trip in Canada we used my friend’s 6-man Kifaru tipi, and it wasn’t spacious for the three of us, gear, and the stove!
Regarding obtaining a “prototype”. There is somewhat questionable logic in eschewing used examples of time proven designs with history and user reviews in favour of a pre-production item of as yet unproven quality.
More importantly though, being chosen to receive a preproduction item is a very low odds option. You have to hope that a company is developing a design that fits your other criteria, when you are looking, and you have to persuade them that you offer something of significant value in exchange.
Early prototypes are tested by people already close to or employed by the company. Later preproduction items are shared with people with demonstrable ability to promote the product. Reviews are sought from people with experience or a platform. Durston X Dome, for example. Lots of established YouTubers were trying them. We got a pass around, we each got a week to look at it, then forward it on after making comments. We got that opportunity because the company saw a market (bushcrafters) to explore and wanted feedback from people with experience. My buddy got a deal with Hill People Gear after buying a Ute pack while guiding an expedition in Borneo, then writing to them and sending photos…examples of his photos and travels. he was in his 30s, had been travelling and adventuring for over 10 years with an impressive résumé
Life, you'll never make it out alive.
independentadventurer.com
It’s likely going to be a tough sell when you are just starting out.
I wish you the very best of luck!!

Chris