I'm all up for the shorter round timer, I like it.
But for EU, we don't normally* calculate our rounds won or lost anywhere and we only care about whether we win or lose, so I don't see the winlimit itself mattering that much if one of the key parts of this new ruleset is to also reduce garbage time.
Instead I'd say that "mp_windifference_min" could rather be in use for EU so that you could still have the comeback potential from a 5-4 situation for example, whilst it already ends the match in a 5-1 situation when it's only a dream anymore for a team to make 4 or even 5 rounds at that point. The main reason why I could see this being reasonable to use is because ETF2L would still keep the same timelimit on from the start, so it's not the same as with RGL where you have another 30 minutes to play after one team has gotten 3 rounds.
But I also do realize that the main reason to even create this ruleset is to finally have a similar ruleset for both regions, which in my opinion requires for both leagues to also run a similar scoring system. RGL can keep their 1 map matches and ETF2L can have 2 map officials but either both should start counting rounds won or only care about maps won and lost.
* Only for the last possible result for tiebreakers, but I'm pretty sure it has only been used less than 5 times in the past 20+ seasons.