Tooltips are a standard accessibility feature. Just because you may not find them helpful doesn't mean others do not benefit. The delay is to ensure they don't get in the way unintentionally (but still allow usage) for those who do not need the accessibility benefit at all times.
Roku was such an easy recommendation for a long time... Non-complex UI, long support for updates, not owned by google or amazon... Far cheaper than LG and Samsung... (Not that Samsung's UI is anywhere near as easy as roku)
But now I guess thats done. Unless an alternate firmware exists or this doesn't hit older TVs I guess I'll be looking for a new TV... Which is a shame because my current 4 year old roku TV is more than capable.