You might change your mind once you get one. The TR-909 sequencer most certainly is part of the appeal and the TR-09 has a few interesting tricks that might make it nice to build at least some patterns there and then sample then as loops into the OT.
Compared to the OT, the TR-09 has a more direct way to set accents, globally on specific steps with an adjustable level, as well as individually on the BD, SD, toms, and the closed HH in addition to that.
You can enter “backbeats”, essentially giving you an additional 16 steps each one a half step delayed for a total of 32 steps per pattern. You can very easily change the last step of a pattern during performance. Shuffle is quicker to change because it can be set using the buttons as well as dialed in precisely. You indeed get flam with adjustable spacing, which is also quicker to add than repeats or microtiming adjustments on the Elektron boxes.
Of course it’s not nearly as deep, but it’s slightly different which can be really refreshing and inspirational. No reason to only ever use a single sequencer.