The agreement allows for the potential supply of up to 500 RCH 155 self-propelled howitzers. Moreover, deliveries under this agreement may be made not only to the Bundeswehr but also to foreign customers. While 500 RCH 155s is an impressive number, the Bundeswehr probably does not need that many at present.
Can you imagine trying to fight against an enemy who has 155mm artillery that can fire on the move operated by crews within an armored hull? How do you even begin to counter that or develop threatening counter artillery battery doctrine?
How does the drone get to the battlefield? How do you protect those support crew? You have to consider that along with the rapidity of artillery response.
https://inv.nadeko.net/watch?v=7zS3Yl0hu7Y
When you start to consider laser guidance on those shells from spotting unmanned assets the loop from being seen to having incoming fire is almost incomprehensibly short under optimum conditions. Counter battery calculations aren’t even that helpful unless you can act on it in literally seconds or minutes if you are lucky.