There's so many inaccuracies there I don't know where to begin.
Last summer, tell me who fancied Ramsdale, White and Tomiyasu? Or Gabriel the summer before that? Ødegaard's arrival was not met with a chorus of acclaim neither.
That you now look back and consider those "safe" signings with a "low chance of failing" says everything about how well they have done here and what good signings they were. It only speaks further to the eye Arteta has for talent and for how clear-sighted he is in building the exact team he wants. Square pegs for square holes, in a team coached to do exactly what he wants. A far cry from the scatter gun recruitment we saw for far too long under Wenger, where I'm sure not even he knew what team he was trying to build. It seemed like we only cared about value and opportunity in the market, and that lack of clarity showed on the pitch.
You keep on banging on about "€300m (EURO) spent" blah blah blah. We spent £230m (POUND) in Emery's two summer transfer windows here and £240m (POUND) in Wenger's last two, and the team just continued to get worse and worse. So, unless you believe fat Sam Allardyce to be a superior coach to those two then thats a strong argument for how much you spend not mattering half as much as whom you spend it on and how well you get them all to fit together on the pitch.
The players listed above are the kind Wenger used to specialise in: U23 and talent to burn but not yet started to light it up yet. Maybe we paid a premium for Ben White relative to what he had achieved, but £22m for Ramsdale, £18m for Tomiyasu, £22m for Gabriel, £25m for Ødegaard - these are player valuations that are the modern day equivalents to what Wenger used to pay for similarly profiled players: Sagna, Koscielny, Ljungberg, Pires, Nasri, Reyes, Henry etc.
And you can add Tavares, Lokonga, Vieira and Marquinhos to that list, however they work out in the end. Even Zinchenko and Jesus are classic Wenger signings - players at a big club doing pretty well, but they fit exactly what you're trying to do on the pitch, and you see another level in them that you can unlock as they come into their best years that perhaps other clubs don't see.
And for the record, Marouane Chamakh was never the main striker here, when he was here so was van Persie, when van Persie left, we signed Giroud. Squillaci played 23 games for us across 3 seasons, when he was here, so were Koscielny, Vermaelen, Mertesacker.
Also, Mikel Arteta has been at Arsenal 2.5 years/seasons, stop being disingenuous with the 4 seasons thing. You're on shaky enough ground as it is as this point without trying to fudge things to suit your argument.