And the Sd.Kfz. 234/2 was capable of penetrating the Daimler, AEC Coventry's armor at long ranges, plus it was better offroad than all of them, much better. The 234/4 couldn't traverse its gun 360 degree's but unlike the others it could take on any Allied tank head on at long ranges, the same you cannot even come close to say about the AEC, Coventry or Daimler.
I don't know about the AEC and Coventry but the Daimler had remarkable cross country ability and the advantage for recce purposes of being a small machine. Its basic design can be seen in the Ferret which stayed in service in many countries until the 90's.
There is no doubt that the 234 was a remarkable machine but it tended to be in the support role supporting the smaller machines for which it was ideal. The Puma was I would suggest the best version, the 234/4 had three problems
1 As mentioned the turret had a limited traverse, which in a potentially fast developing situation as often happened on recce missions is a disadvantage
2 They only built I believe around 90 of them
3 They only carried around 15 rounds
The 2pd was pretty useless as an anti tank weapon but sufficient against other armoured cars, SPG's and other light veihicles. It was improved in some machines by the use of a littlejohn adapter but this meant it couldn't fire HE shells which was a significant disadvantage compared to the small increase in penetration.
Any Daimler suddenly finding itself in front of a German tank would almost certainly fire the smoke dischargers and run. This was easy to do as the commander had a duplicate steering wheel and controls so he could drive it backwards, no need to turn around!!
This is why in a British Armoured car regiment ,the Daimler recce troops were supported by a heavy troop armed with a 6pd or 75mm gun depending on the Armoured car in question.
I don't disagree with the idea that a 20mm would have been better bet probably a matter of six of one and half a dozen of another. The British did have Humber Armoured Cars armed with a 15mm Bessa HMG plus a co ax LMG and I have never heard that they suffered because of it.