I think T4 assault bots need a bigger nerf.
I agree that T3 was OP in relation to T2 and T1, and I think this patch makes sense in that regard.
I think this has however wrecked the balance between T3 land and T4 assault bots.
Late game, build time nerfs are more or less pointless. You can spam monkeylords like mad if you want to and build the T3 engineers to do it, and they're easier to use, easier to micro and require less infrastructure than T3 land unit spam.
T3 land should not be replaced by T4 assault bots, T4 assault bots should compliment T3 land. They should compliment T3 land the way they always have, by requiring less infrastructure to build, by being buildable underwater by engineers or in far off corners of the map, by being a decent backup if your T3 land unit production is destroyed or even if it just isn't sufficient, by allowing you to immediately use reclaim after a won battle that would be hard to utilize any other way and by being easier to micro.
T4 assault bots should not beat T3 land mass for mass, or even really come close to that. Their role should not be to negate a large army that requires far more infrastructure and time to acquire than T4 assault bots.
I think the original balance between T3 and T4 was very good. I think its likely why the T2/T3 balance was always a bit off, because T3 had to be good to not be completely outclassed by T4.
I think T4 assault bots shoudl be nerfed in proportion to the T3 nerfs, including but not limited to weapon range, damage health and unit speed.
I think after the nerf, the build costs should be brought back down to force players to scout for early T4 built without infrastructure investment. That strategy should make a lot of sense, although perhaps the build timers shouldn't be brought back down to where they were originally. A slight nerf there probably makes sense.
Fundamentally, the problem is that T3 is much worse for the mass cost now, while T4 is essentially unchanged.
Thank you for taking the time to consider this.