Day one from the vanilla Frontier has always announced that they were going to implement planet landing as Horizons was already in the works and had a VERY successful release with minimal flaws and VERY high reviews. I truly don't think they were going for space legs but there are quite a few reasons for space lags, "as the community wanted them" and "ship interiors" just to name two of several reasons for Odyssey. Which the race to release ended up as a train wreck as was released as an Alpha version, basically, without any Beta testing as the year of play was quite similar to a Beta from players, as most have agreed that was sort of the quick beta plan.
Fleet Carriers were the last thing before Frontier dumped Horizons as Carriers were meant to extend fleets together while moving thus eliminating the cost of transferring ships as we had before, but the cost was meant for dedicated players, IMO anyway, so the price of Carriers was so high. Not sure I'd wanted to see that but understandable as a squads point of view anyway.
Now I do believe Odyssey was a rush, thus the terrible release of an Alpha, as proven, due to the reasons mentioned above. But I do know that Frontier never really had any intent for space legs do to we already had an SRV for planet-side travel. But this is all speculation as Frontier never gave a "real" road map per say, just a very large space simulator.
But this is what we've got now so Frontier will push forward as the cancelation of Consoles will relieve more resources to improve Odyssey, hopefully no further work done on planets will change and come back into the picture. Personally, I would like to see Frontier get back into its original plan as a space simulator, BUT with more roleplay content as just the precenting of slight Guardian/ Thargoid threats.
But this is all just my personal opinion of course.